On Monday, an explosion ripped up a section of road across the Kerch Strait bridge, Putin’s pet project linking the Russian mainland with illegally annexed Crimea. It was the second time the bridge was hit in less than a year. The last time, in October, a truck bomb ruined part of the rail lines. This time, the damage was the work of naval drones. Vladimir Putin promised retribution and he quickly delivered: He pulled Russia out of the expiring grain deal that allowed Ukrainian agricultural products to leave the ports Russia has blockaded, and then attacked those ports—Odesa and Mykolaiv—destroying a massive fuel depot. The attack, his spokesman confirmed, was revenge.