Russian military forces are massing on the border of Ukraine. This has prompted widespread concern that Russia may once again seek to invade Ukraine. On the line with me to discuss this unfolding crisis is John Herbst, Senior Director of the Eurasia Center at the Atlantic Council and Former US Ambassador to Ukraine. We kick off with a conversation about what this military buildup may signal - or not - about Vladimir Putin's intensions on Ukraine before having a discussion about what diplomatic and military options exist to deter Russian aggression.  Links: John Herbst's article on the Atlantic Council's website. Access to a premium subscription and the crypto and global development podcast series.  https://www.patreon.com/GlobalDispatches