NATO Secretary General Jens Stoltenberg addresses a press conference at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

German Defense Minister Annegret Kramp-Karrenbauer (4th R, Rear) attends the Meeting of the North Atlantic Council in Defense Ministers' session at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

Attendees of meetings of NATO ministers of defense pose for a photo at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

Italian Defense Minister Lorenzo Guerini (3rd R) attends the Meeting of the North Atlantic Council at Defense Ministers' session at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

NATO Secretary General Jens Stoltenberg (L, Front) speaks with UK Defense Secretary Ben Wallace (R, Front) at the official portrait of meetings of NATO ministers of defense at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

NATO Secretary General Jens Stoltenberg makes a statement at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

NATO Secretary General Jens Stoltenberg (L) speaks with U.S. Secretary of Defense Mark Esper at the official portrait of meetings of NATO ministers of defense at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

Turkish Defense Minister Hulusi Akar (C) attends the Meeting of the North Atlantic Council in Defense Ministers' session at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)

German Defense Minister Annegret Kramp-Karrenbauer (C) attends the official portrait of meetings of NATO ministers of defense at the NATO headquarters in Brussels, Belgium, on Oct. 24, 2019. (Photo by Riccardo Pareggiani/Xinhua)