It happened. On Monday, Russian President Vladimir Putin sent troops — er, “peacekeepers,” as Moscow’s propaganda machine is calling them — into separatist regions of Ukraine. The move came less than a day after Putin and President Joe Biden agreed “in principle” to make a last-ditch effort at diplomacy with a face-to-face meeting. Secretary of State Antony Blinken was set to iron out those details in a meeting with his Kremlin counterpart Thursday. But with the Russian military rolling across Ukraine’s borders, there are questions about whether that can happen.

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