Bob asks Joe: What are the chances this war goes nuclear? ... Joe lays out Russia’s and America’s nuclear arsenals ... What would make Putin roll the nuclear dice? ... Why atrocities in Bucha could make for a longer, bloodier war ... Joe: The US withdrawal from Cold War-era treaties led to the current nuclear arms race ... How US foreign policy laid the ground for Putin’s invasion ... Bob searches for silver linings. Joe sees a darkening cloud. ... Assessing the Biden administration’s foreign policy record ...