Russia has threatened consequences for Lithuania after the NATO member state blocked transit of EU-sanctioned goods through its territory to the Russian exclave of Kaliningrad. Ahead of the NATO summit in Madrid, Dan Hamilton explains the new front in tensions between NATO and Russia and the potential for Russian escalation.  Full show notes and transcript: https://brook.gs/3n9eWwX  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.