European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Union Health Commissioner Stella Kyriakides holds a press conference on COVID-19 therapeutics strategy at the European Commission in Brussels, Belgium May 6, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission President Ursula von der Leyen welcomes Kosovo's Prime Minister Albin Kurti before their meeting at the EU headquarters, in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission President Ursula von der Leyen welcomes Kosovo's Prime Minister Albin Kurti before their meeting at the EU headquarters, in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission President Ursula von der Leyen welcomes Kosovo's Prime Minister Albin Kurti before their meeting at the EU headquarters, in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission President Ursula von der Leyen poses as she welcomes Kosovo's Prime Minister Albin Kurti before their meeting at the EU headquarters, in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission President Ursula von der Leyen and Kosovo's Prime Minister Albin Kurti pose before their meeting at the EU headquarters, in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti poses as he arrives for a meeting at the EU headquarters in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti gives a joint news conference with European Union foreign policy chief Josep Borrell (not pictured) at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti gives a joint news conference with European Union foreign policy chief Josep Borrell (not pictured) at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti gives a joint news conference with European Union foreign policy chief Josep Borrell at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

High-Representative of the European Union for Foreign Affairs and Security Policy Josep Borrell speaks during a joint news conference with Kosovo's Prime Minister at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

High-Representative of the European Union for Foreign Affairs and Security Policy Josep Borrell speaks during a joint news conference with Kosovo's Prime Minister at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

High-Representative of the European Union for Foreign Affairs and Security Policy Josep Borrell speaks during a joint news conference with Kosovo's Prime Minister at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti gives a joint news conference with European Union foreign policy chief Josep Borrell (not pictured) at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti gives a joint news conference with European Union foreign policy chief Josep Borrell (not pictured) at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

Kosovo's Prime Minister Albin Kurti gives a joint news conference with European Union foreign policy chief Josep Borrell at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

High-Representative of the European Union for Foreign Affairs and Security Policy Josep Borrell speaks during a joint news conference with Kosovo's Prime Minister at the EEAS building in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission Vice President Maros Sefcovic speaks during a news conference on 'Better Regulation: Joining forces to make better laws', in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission Vice President Maros Sefcovic speaks during a news conference on 'Better Regulation: Joining forces to make better laws', in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission Vice President Maros Sefcovic looks on during a news conference on 'Better Regulation: Joining forces to make better laws', in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission Vice President Maros Sefcovic speaks during a news conference on 'Better Regulation: Joining forces to make better laws', in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission Vice President Maros Sefcovic speaks during a news conference on 'Better Regulation: Joining forces to make better laws', in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Commission Vice President Maros Sefcovic speaks during a news conference on 'Better Regulation: Joining forces to make better laws', in Brussels, Belgium April 29, 2021. Kenzo Tribouillard/Pool via REUTERS

European Council President Charles Michel attends a video conference meeting with Georgian President Salome Zurabishvili over the signature of a deal to end the current political crisis in Georgia at the European Council building in Brussels, Belgium April 19, 2021. Kenzo Tribouillard/Pool via REUTERS

Georgian President Salome Zurabishvili is seen on a monitor during a video conference with the European Council President Charles Michel over the signature of a deal to end the current political crisis in Georgia at the European Council building in Brussels, Belgium April 19, 2021. Kenzo Tribouillard/Pool via REUTERS

Georgian President Salome Zurabishvili is seen on a monitor during a video conference with the European Council President Charles Michel over the signature of a deal to end the current political crisis in Georgia at the European Council building in Brussels, Belgium April 19, 2021. Kenzo Tribouillard/Pool via REUTERS

European Council President Charles Michel attends a video conference meeting with Georgian President Salome Zurabishvili over the signature of a deal to end the current political crisis in Georgia at the European Council building in Brussels, Belgium April 19, 2021. Kenzo Tribouillard/Pool via REUTERS

European Council President Charles Michel attends a video conference meeting with Georgian President Salome Zurabishvili over the signature of a deal to end the current political crisis in Georgia at the European Council building in Brussels, Belgium April 19, 2021. Kenzo Tribouillard/Pool via REUTERS

European Council President Charles Michel attends a video conference meeting with Georgian President Salome Zurabishvili over the signature of a deal to end the current political crisis in Georgia at the European Council building in Brussels, Belgium April 19, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Defense Secretary Lloyd Austin poses as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg arrives for a joint news conference with U.S. Defence Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg gestures as he speaks during a joint news conference with U.S. Defence Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

Secretary General of the Transatlantic Alliance NATO Jens Stoltenberg shows a document concerning Afghanistan during a joint news conference with U.S. Defence Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken looks on during a joint news conference with Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg and U.S. Defence Secretary Lloyd Austin following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken, Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg and U.S. Defence Secretary Lloyd Austin speak during a joint news conference following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken looks at Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg gesturing as he speaks during a joint news conference with U.S. Defence Secretary Lloyd Austin following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken, Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg and U.S. Defence Secretary Lloyd Austin speak during a joint news conference following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken and Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg arrive for a joint news conference with U.S. Defence Secretary Lloyd Austin, following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken and Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg arrive for a joint news conference with U.S. Defence Secretary Lloyd Austin, following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg delivers a speech during a joint news conference with U.S. Defence Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken, following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

Secretary General of the Transatlantic Alliance NATO's chief Jens Stoltenberg delivers a speech during a joint news conference with U.S. Defence Secretary and U.S. Secretary of State, following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

U.S. Secretary of State Antony Blinken arrives for a joint news conference with U.S. Defence Secretary and Secretary General of the Transatlantic Alliance NATO, following a meeting after the United States announced the withdrawal of all its troops from the Afghanistan by September 11, 2021, at NATO's headquarters in Brussels, Belgium April 14, 2021.Kenzo Tribouillard/Pool via REUTERS

NATO Secretary General Jens Stoltenberg (L) speaks with U.S. Defence Secretary Lloyd Austin (R) as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

NATO Secretary General Jens Stoltenberg (L) welcomes U.S. Defence Secretary Lloyd Austin (R) as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin looks on as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin poses as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin (L) poses with NATO Secretary General Jens Stoltenberg (R), as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

U.S. Defence Secretary Lloyd Austin (L) is welcomed by NATO Secretary General Jens Stoltenberg (R), as he arrives for a meeting of foreign ministers of the U.S., Britain, France and Germany on Afghanistan at NATO's headquarters in Brussels, Belgium, April 14, 2021. Kenzo Tribouillard/Pool via Reuters

NATO Secretary General Jens Stoltenberg speaks with U.S. Defence Secretary Lloyd Austin at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

NATO and U.S. flags are seen before a news conference at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS

NATO Secretary General Jens Stoltenberg speaks during a news conference with U.S. Secretary of State Antony Blinken at NATO's headquarters in Brussels, Belgium April 14, 2021. Kenzo Tribouillard/Pool via REUTERS