White House officials say the Biden administration is considering the possibility of a phone call—between President Joe Biden and President Vladimir Putin—to address the massing of Russian troops at the border of Ukraine. Ukrainian officials have estimated more than 90,000 Russian troops are near its border and in Russian-occupied Crimea. Biden said Dec. 3 that his administration was “putting together what I believe to be the most comprehensive, and meaningful, set of initiatives to make it very, very difficult for Mr. Putin to go ahead and do what people are worried he may do. “But that’s in play right now,” he told reporters in Washington. White House press secretary Jen Psaki later reiterated the president’s statement, saying the U.S. wants to be prepared should Putin decide to invade Ukraine. “We know what President Putin has done in the past. “We see that he is putting in place the capacity to …