Ukraine-Russia crisis: What to know about the fears of war

NATO Secretary General Jens Stoltenberg listens Romania's President Klaus Iohannis during a joint press conference at the Mihail Kogalniceanu airbase, near the Black Sea port city of Constanta, eastern Romania, Friday, Feb. 11, 2022. Stoltenberg paid an official visit to Romania on Friday, where he joined the country’s president at a military airbase that will host some of the 1,000 U.S. troops deployed to the country as the alliance bolsters its forces on the eastern flank as tensions soar between Russia and Ukraine. (AP Photo/Andreea Alexandru)