Tensions are mounting in Moldova, a small country on Ukraine’s southwestern border, where Russia has been accused of laying the groundwork for a coup that could drag the nation into the Kremlin’s war. Moldova’s President, Maia Sandu, has accused Russia of using “saboteurs” disguised as civilians to stoke unrest amid a period of political instability, echoing similar warnings from Ukrainian President Volodymyr Zelensky. Russian President Vladimir Putin has meanwhile baselessly accused Kyiv of planning its own assault on a pro-Russian territory in Moldova where Moscow has a military foothold, heightening fears that he is creating a pretext for a Crimea-style...