A banner bearing the NATO logo is fixed on the facade of Atta conference centre in Riga, Latvia, on November 28, 2021, two days before the start of NATO Foreign Ministers meetings. - EU and NATO leaders on November 28, 2021 vowed to step up cooperation against hybrid threats on a visit to Lithuania dominated by talks on the Belarus migrant crisis and Russia's military build-up near Ukraine. The upcoming NATO foreign ministers meeting in Latvia will include US Secretary of State Antony Blinken. (Photo by Gints Ivuskans / AFP)

A banner bearing the NATO logo is fixed on the facade of Atta conference centre in Riga, Latvia, on November 28, 2021, two days before the start of NATO Foreign Ministers meetings. - EU and NATO leaders on November 28, 2021 vowed to step up cooperation against hybrid threats on a visit to Lithuania dominated by talks on the Belarus migrant crisis and Russia's military build-up near Ukraine. The upcoming NATO foreign ministers meeting in Latvia will include US Secretary of State Antony Blinken. (Photo by Gints Ivuskans / AFP)

A banner bearing the NATO logo is fixed on the facade of Atta conference centre in Riga, Latvia, on November 28, 2021, two days before the start of NATO Foreign Ministers meetings. - EU and NATO leaders on November 28, 2021 vowed to step up cooperation against hybrid threats on a visit to Lithuania dominated by talks on the Belarus migrant crisis and Russia's military build-up near Ukraine. The upcoming NATO foreign ministers meeting in Latvia will include US Secretary of State Antony Blinken. (Photo by Gints Ivuskans / AFP)

The flags of NATO member countries are seen on a giant billboard in Riga, Latvia, on November 28, 2021, two days before the start of NATO Foreign Ministers meetings. - EU and NATO leaders on November 28, 2021 vowed to step up cooperation against hybrid threats on a visit to Lithuania dominated by talks on the Belarus migrant crisis and Russia's military build-up near Ukraine. The upcoming NATO foreign ministers meeting in Latvia will include US Secretary of State Antony Blinken. (Photo by Gints Ivuskans / AFP)

The Atta conference centre, venue of an upcoming NATO foreign ministers meeting, is pictured in Riga, Latvia, on November 28, 2021, two days before the start of the meetings. - EU and NATO leaders on November 28, 2021 vowed to step up cooperation against hybrid threats on a visit to Lithuania dominated by talks on the Belarus migrant crisis and Russia's military build-up near Ukraine. The upcoming NATO foreign ministers meeting in Latvia will include US Secretary of State Antony Blinken. (Photo by Gints Ivuskans / AFP)