Ukraine's President Volodymyr Zelenskiy speaks to media during a news conference in Kyiv, Ukraine, Wednesday, May 20, 2020. Zelenskiy announced an investigation Wednesday into the leaked tapes that allegedly feature the country???s former president Petro Poroshenko and former U.S. Vice President Joe Biden and appear to be yet another episode of an anti-Biden campaign waged by a Ukrainian lawmaker. (Sergey Dolzhenko/Pool Photo via AP)

Ukraine's President Volodymyr Zelenskiy speaks to the media during a news conference in Kyiv, Ukraine, Wednesday, May 20, 2020. At the press conference marking Zelenskiy???s one year in office, the president answered questions about domestic affairs, foreign policy and his main achievements. (Sergey Dolzhenko/Pool Photo via AP)

Ukraine's President Volodymyr Zelenskiy speaks to media during a news conference in Kyiv, Ukraine, Wednesday, May 20, 2020. Zelenskiy announced an investigation Wednesday into the leaked tapes that allegedly feature the country???s former president Petro Poroshenko and former U.S. Vice President Joe Biden and appear to be yet another episode of an anti-Biden campaign waged by a Ukrainian lawmaker. (Sergey Dolzhenko/Pool Photo via AP)

Ukraine's President Volodymyr Zelenskiy speaks to the media during a news conference in Kyiv, Ukraine, Wednesday, May 20, 2020. At the press conference marking Zelenskiy's one year in office, the president answered questions about domestic affairs, foreign policy and his main achievements. (Sergey Dolzhenko/Pool Photo via AP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky arrives to hold a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)

Ukrainian President Volodymyr Zelensky holds a press conference marking his first year in office at Kiev's Mariinsky Palace on May 20, 2020. (Photo by SERGEY DOLZHENKO / POOL / AFP)