The diplomatic talks in Geneva this week are of a kind not seen in a long time: an effort to defuse the possibility of a major war in Europe.President Vladimir V. Putin of Russia has amassed military equipment and personnel on the border with Ukraine.President Biden has warned that there will be consequences if Mr. Putin decides to invade, but what can Washington do to impel the Kremlin to back down?Guest: David E. Sanger, a White House and national security correspondent for The New York Times.Sign up here to get The Daily in your inbox each morning. And for an exclusive look at how the biggest stories on our show come together, subscribe to our newsletter. Background reading: Russia and the United States expressed some optimism after negotiations in Geneva, but they did not break an impasse over Moscow’s demand that Ukraine never become a member of NATO.Can the West stop Russia from invading Ukraine? Here’s a guide to what’s at stake.For more information on today’s episode, visit nytimes.com/thedailyTranscripts of each episode will be made available by the next workday.