Russian President Vladimir Putin has a lot to worry about these days. What he originally planned as a quick regime-change operation in Ukraine has now gone on longer than the Soviet Union’s fight against Nazi Germany, and Kyiv is increasingly bringing the war to the Russian heartland. (On June 3, guests at Putin’s showcase international forum in St. Petersburg awoke to the sight of blazing fires from Ukrainian drones.) The Russian economy is showing serious signs of strain . And even China,