In response to the escalating threat, President Trump confirmed Monday that the U.S. will send additional Patriot air defense missiles to Ukraine. He noted that the European Union would finance the purchase of what he described as "various pieces of very sophisticated" U.S. weaponry.

U.S. President Donald Trump meets with NATO Secretary General Mark Rutte (not pictured), on the day President Trump announces a deal to get U.S. weapons to NATO, in the Oval Office at the White House in Washington,