Russian military forces invaded Ukraine on Thursday, precipitating a dangerous security and humanitarian crisis in Europe.  In a live Twitter Spaces conversation, a Brookings roundtable assessed the security and economic ripple effects of Russia’s invasion and explained what sanctions the U.S. and Europe have imposed so far and what further tools they can bring to bear. Show notes and transcript: https://brook.gs/3pgBbm5  Follow Brookings podcasts on Apple or Google podcasts, or on Spotify. Send feedback email to podcasts@brookings.edu and follow us and tweet us at @policypodcasts on Twitter. The Current is part of the Brookings Podcast Network.