NATO prepares 'virus-free' zone for summit; Biden invited
U.S. Secretary of State Antony Blinken speaks during a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken speaks during a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 04:34 AM EDT
Belgium's Foreign Minister Sophie Wilmes arrives for a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Belgium's Foreign Minister Sophie Wilmes arrives for a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 07:57 AM EDT
U.S. Secretary of State Antony Blinken, right, and NATO Secretary General Jens Stoltenberg arrive to give remarks prior to a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

U.S. Secretary of State Antony Blinken, right, and NATO Secretary General Jens Stoltenberg arrive to give remarks prior to a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

Mar. 23, 2021 06:23 AM EDT
U.S. Secretary of State Antony Blinken, right, walks with NATO Secretary General Jens Stoltenberg, center, prior to addressing a media conference at a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken, right, walks with NATO Secretary General Jens Stoltenberg, center, prior to addressing a media conference at a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 04:34 AM EDT
U.S. Secretary of State Antony Blinken, left, bumps elbows with NATO Secretary General Jens Stoltenberg, right, after a moderated event prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken, left, bumps elbows with NATO Secretary General Jens Stoltenberg, right, after a moderated event prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 06:01 AM EDT
U.S. Secretary of State Antony Blinken delivers remarks with NATO Secretary General Jens Stoltenberg prior to a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

U.S. Secretary of State Antony Blinken delivers remarks with NATO Secretary General Jens Stoltenberg prior to a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

Mar. 23, 2021 06:23 AM EDT
U.S. Secretary of State Antony Blinken speaks during a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken speaks during a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 04:34 AM EDT
Spanish Foreign Minister Arancha Gonzalez Laya, right, and French Foreign Minister Jean-Yves Le Drian, center, talk to Italy's Foreign Minister Luigi Di Maio during a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

Spanish Foreign Minister Arancha Gonzalez Laya, right, and French Foreign Minister Jean-Yves Le Drian, center, talk to Italy's Foreign Minister Luigi Di Maio during a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

Mar. 23, 2021 08:27 AM EDT
French Foreign Minister Jean-Yves Le Drian, center left, greets Spanish Foreign Minister Arancha Gonzalez Laya, center right, with a fist bump during a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

French Foreign Minister Jean-Yves Le Drian, center left, greets Spanish Foreign Minister Arancha Gonzalez Laya, center right, with a fist bump during a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 07:56 AM EDT
U.S. Secretary of State Antony Blinken, left, speaks with Turkish Foreign Minister Mevlut Cavusoglu during a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken, left, speaks with Turkish Foreign Minister Mevlut Cavusoglu during a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 07:47 AM EDT
Turkish Foreign Minister Mevlut Cavusoglu, center, talks to Norway's Foreign Minister Ine Eriksen Soreide, right, and French Foreign Minister Jean-Yves Le Drian during a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

Turkish Foreign Minister Mevlut Cavusoglu, center, talks to Norway's Foreign Minister Ine Eriksen Soreide, right, and French Foreign Minister Jean-Yves Le Drian during a NATO foreign ministers meeting at NATO headquarters in Brussels, Tuesday, March 23, 2021. (Yves Herman, Pool via AP)

Mar. 23, 2021 08:10 AM EDT
U.S. Secretary of State Antony Blinken, left, walks with NATO Secretary General Jens Stoltenberg, right, after addressing a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken, left, walks with NATO Secretary General Jens Stoltenberg, right, after addressing a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 04:34 AM EDT
A group of NATO foreign ministers, right, reach out to greet Turkish Foreign Minister Mevlut Cavusoglu, center left, with a fist bump during a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

A group of NATO foreign ministers, right, reach out to greet Turkish Foreign Minister Mevlut Cavusoglu, center left, with a fist bump during a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 07:57 AM EDT
U.S. Secretary of State Antony Blinken speaks during a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

U.S. Secretary of State Antony Blinken speaks during a media conference prior to a meeting of NATO foreign ministers at NATO headquarters in Brussels on Tuesday, March 23, 2021. (AP Photo/Virginia Mayo, Pool)

Mar. 23, 2021 04:34 AM EDT