Nobel Peace Prize laureate, Yemeni journalist, politician and human rights activist Tawakkol Karman gestures as she attends a panel discussion at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 17, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

(L-R) Helle Thorning-Schmidt, outgoing CEO of Save the Children and former Danish Prime Minister, Henrietta Fore, CEO of the United Nations Children's Fund (UNICEF), Kumi Naidoo, Secretary-General of Amnesty International, Nobel Peace Prize laureate, Yemeni journalist, politician and human rights activist Tawakkol Karman and host Lyse Doucet attend a panel discussion at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 17, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

The chairman of the Israel Resilience party Benny Gantz (L) welcomes a guest prior to give a speech at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 17, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

Turkish Defence Minister Hulusi Akar attends a panel discussion during the 55th Munich Security Conference in Munich, southern Germany, on February 17, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

Russian Deputy Foreign Minister Sergey Vershinin attends a panel discussion during the 55th Munich Security Conference in Munich, southern Germany, on February 17, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

chairman of the Israel Resilience party Benny Gantz (C) arrives to give a speech at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 17, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / DPA / AFP) / Germany OUT

White House Presidential Advisor Ivanka Trump and Senior Advisor to the President Jared Kushner talk to von German Defence Minister Ursula von der Leyen during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

White House Presidential Advisor Ivanka Trump attends a panel discussion during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. (Photo by Christof STACHE / AFP)

White House Presidential Advisor Ivanka Trump attends a panel discussion during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. (Photo by Christof STACHE / AFP)

White House Presidential Advisor Ivanka Trump attends a panel discussion during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. (Photo by Christof STACHE / AFP)

German Chancellor Angela Merkel (L) and Ukraine's President Petro Poroshenko talk during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

White House Presidential Advisor Ivanka Trump (L) and Leader of the Christian Democratic Union (CDU) Annegret Kramp-Karrenbauer talk during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

White House Presidential Advisor Ivanka Trump and Senior Advisor to the President Jared Kushner talk to von German Defence Minister Ursula von der Leyen during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

White House Presidential Advisor Ivanka Trump and Senior Advisor to the President Jared Kushner talk to von German Defence Minister Ursula von der Leyen during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

White House Presidential Advisor Ivanka Trump (C) talks with German Defence Minister Ursula von der Leyen (R) during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Chancellor Angela Merkel (R) arrives with Wolfgang Ischinger, chairman of the Munich Security Conference (MSC), for the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Chancellor Angela Merkel (C) welcomes participants of the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

German Chancellor Angela Merkel speaks during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

German Chancellor Angela Merkel (R) and US Vice President Mike Pence (L) leave a photo call during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

German Chancellor Angela Merkel (R) and US Vice President Mike Pence pose during a photo call at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

Yang Jiechi, member of China's political bureau, speaks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

German Chancellor Angela Merkel (R) poses with Egypt's President Abdel Fattah el-Sisi at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

Russian Foreign Minister Sergei Lavrov speaks during the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

Christine Lagarde (L), Managing Director and Chairwoman of the International Monetary Fund (IMF), host Morgan Ortagus (front) and US senator Lindsey O Graham listen to White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

US Vice President Michael Pence (R) and NATO Secretary General Jens Stoltenberg talk during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence (R) talks to NATO Secretary General Jens Stoltenberg during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence gives a statement in front of the Bayerischer Hof hotel at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Mike Pence (R) shakes hands with Afghanistan's President Mohammad Ashraf Ghani during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Mike Pence (R) and Afghanistan's President Mohammad Ashraf Ghani hold talks during their bitaleral meeting at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Mike Pence (R) shakes hands with Afghanistan's President Mohammad Ashraf Ghani during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Mike Pence (C) crosses a street to give a statement in front of the Bayerischer Hof hotel at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence (R) shake hands with Ukrainian President Petro Poroshenko during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence (R) shake hands with Ukrainian President Petro Poroshenko during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence (R) talks with Ukrainian President Petro Poroshenko during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence and Ukrainian President Petro Poroshenko pose during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

US Vice President Michael Pence (R) talks with Ukrainian President Petro Poroshenko during their bitaleral talks at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

German Chancellor Angela Merkel (R) and US Vice President Mike Pence (L) leave after a photo call during the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

German Chancellor Angela Merkel shakes hands with Egypt's President Abdel Fattah el-Sisi at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Sven Hoppe / DPA / AFP) / Germany OUT

Christine Lagarde (L), Managing Director and Chairwoman of the International Monetary Fund (IMF), listens to White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / DPA / AFP) / Germany OUT

Christine Lagarde (L), Managing Director and Chairwoman of the International Monetary Fund (IMF), speaks next to White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / DPA / AFP) / Germany OUT

Christine Lagarde (L), Managing Director and Chairwoman of the International Monetary Fund (IMF), and host Morgan Ortagus (R) listen to White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / DPA / AFP) / Germany OUT

White House Presidential Advisor Ivanka Trump speaks during a panel discussion at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / DPA / AFP) / Germany OUT

German Chancellor Angela Merkel shakes hands with Afghanistan's President Ashraf Ghani at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Sven Hoppe / DPA / AFP) / Germany OUT

German Foreign Minister Heiko Maas (R) shakes hands with member of China's political bureau Yang Jiechi at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / DPA / AFP) / Germany OUT

A protester holds a poster reading "Disarm instead of military buildup - No to war" during a demonstration against the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Angelika Warmuth / DPA / AFP) / Germany OUT

A protester holds a poster reading "We don't need rockets but local public transport" during a demonstration against the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Angelika Warmuth / DPA / AFP) / Germany OUT

A protester dressed as an angel holds a poster reading "Stop NATO power" during a demonstration against the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Angelika Warmuth / DPA / AFP) / Germany OUT

Protesters hold posters reading "War is bad" (L) and "We want peace" during a demonstration against the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Angelika Warmuth / DPA / AFP) / Germany OUT

Protesters hold a banner reading "No new medium-range missiles in Europe" during a demonstration against the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Angelika Warmuth / DPA / AFP) / Germany OUT

Former US Vice President Joe Biden gives a speech at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Sven Hoppe / DPA / AFP) / Germany OUT

former US Vice President Joe Biden gives a speech at the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Sven Hoppe / DPA / AFP) / Germany OUT

A protester wears a mask of US President Donald Trump and holds a gas mask during a demonstration against the 55th Munich Security Conference in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Sina Schuldt / DPA / AFP) / Germany OUT

German Chancellor Angela Merkel (R) and US Vice President Mike Pence shake hands at a photo call during the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 16, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by Sven Hoppe / dpa / AFP) / Germany OUT

Norway's Prime Minister Erna Solberg leaves the car as she arrives at the Hotel Bayerischer Hof for the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by THOMAS KIENZLE / AFP)

Wolfgang Ischinger, chairman of the Munich Security Conference (MSC), wears a jersey with the European flag with one missing star while giving a speech to open the 55th Munich Security Conference in Munich, southern Germany, on February 14, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

German Defence Minister Ursula von der Leyen gives a speech during the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 14, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

Wolfgang Ischinger, chairman of the Munich Security Conference (MSC), gives a speech to open the 55th Munich Security Conference in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) will take place from February 15 to 17, 2019. (Photo by Christof STACHE / AFP)

German Foreign Minister Heiko Maas (2nd R)walks next to Foreign Minister of France Jean-Yves Le Drian as they arrive for a dinner meeting on the sidelines of the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Foreign Minister Heiko Maas (2nd R)walks next to Foreign Minister of France Jean-Yves Le Drian as they arrive for a dinner meeting on the sidelines of the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Foreign Minister Heiko Maas (R) walks next to Foreign Minister of France Jean-Yves Le Drian as they arrive for a dinner meeting on the sidelines of the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Foreign Minister Heiko Maas (R) and Foreign Minister of Canada Chrystia Freeland are pictured prior to a dinner meeting on the sidelines of the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Foreign Minister Heiko Maas (2nd L), Foreign Minister of France Jean-Yves Le Drian (2nd R), Foreign Minister of Canada Chrystia Freeland (L) and Foreign Minister of Japan, Taro Kono (R), are pictured prior to a dinner meeting on the sidelines of the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Thomas KIENZLE / AFP)

German Defence Minister Ursula von der Leyen (R) meets with White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / dpa / AFP) / Germany OUT

German Defence Minister Ursula von der Leyen (R) meets with White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / dpa / AFP) / Germany OUT

German Defence Minister Ursula von der Leyen (R) meets with White House Presidential Advisor Ivanka Trump at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / dpa / AFP) / Germany OUT

German Defence Minister Ursula von der Leyen (2nd L) meets with White House Presidential Advisor Ivanka Trump (2nd R) with their delegations at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / dpa / AFP) / Germany OUT

White House Presidential Advisor Ivanka Trump (2nd R) meets with the German Defence Minister (not in picture) and their delegations at the 55th Munich Security Conference (MSC) in Munich, southern Germany, on February 15, 2019. - The 2019 edition of the Munich Security Conference (MSC) takes place from February 15 to 17, 2019. (Photo by Tobias Hase / dpa / AFP) / Germany OUT