Fill in the Blanks Learn english with news -1Online version Write the right word by Teacher Online 1 warning decision fear severed stark leave forces call timeline readiness notice arrange facts hadn't brief troops Adviser joins halted deployed accelerated issued Judy Woodruff : Today , the Biden administration its most urgent yet that Russia could launch a war in Ukraine at any time . More than 100 , 000 Russian surround Ukraine on three sides , and the president's national security adviser , Jake Sullivan , urged Americans to by the end of the weekend . U . S . officials tell our Nick Schifrin they the war could start next week . And Nick me now . So , Nick , what is it that has led to this more language coming from the administration ? Nick Schifrin : Yes , Judy , as you have said , Russia has one of the largest that Europe has seen in the last 50 years . And Western and U . S . officials tell me that , in recent days , the U . S . saw those forces increase their for a possible invasion . And U . S . officials became convinced that the is being into next week . And so those combined led U . S . and military officials to their NATO allies . And three Western and U . S . officials tell me that President Vladimir Putin had made the to invade . Now , National Security Jake Sullivan was asked about my reporting by my colleague Amna Nawaz , and Sullivan said that Putin made that just yet . With virtually no , communications to a departure could be , and commercial transit .