Who sabotaged the Nord Stream gas pipelines—and what happens next? ... The uncertain consequences of Russia's referendums in Ukraine ... How Russia’s military failures could lead to Putin’s downfall ... How much pro-Russian sentiment is there in eastern and southeastern Ukraine? ... The odds Putin goes nuclear and the likely western response ... What’s Biden’s endgame in Ukraine? ... Is it too late for a peace deal? ... The chances that China comes to Putin’s rescue ...