Ukraine says 40,000 Russian troops have amassed on its eastern border, prompting some to warn Russia could be preparing for war. Another 40,000 troops are in annexed Crimea. But others say Russia is sending its soldiers to the region as a show of force and intimidation to Ukraine and its allies. The U.S. and NATO have vowed to support Ukraine, though it is not a member of the alliance. Analysts also say Russia could be seeking a distraction from domestic issues, including the imprisonment of Alexei Navalny.

Meanwhile, Defense Secretary Lloyd Austin said Tuesday the U.S. military will increase its presence in Germany — a reversal from the Trump administration’s plans to withdraw troops. Austin said the move reaffirms U.S. support to NATO and “improves our ability to surge forces at a moment’s notice to defend our allies.”