President Vladimir Putin’s swift and severe response to an attack on his Black Sea fleet reflects a war that is increasingly marked by a duel between long range Russian missiles and Ukraine’s innovative array of drones and truck bombs.

Putin on Monday made clear why he was suspending Russia’s involvement in a deal that for three months had allowed much-needed Ukrainian grain to be shipped to global markets: He wants to secure the Russian Navy’s ships after an attack by air and sea drones.

On Wednesday, Russia’s defense ministry said Moscow was rejoining the grain agreement, after receiving assurances from Ukraine that the safe passage corridor it established won’t be used for attacks. The episode speaks volumes about the dual nature of a war that’s now being fought as intensely behind the front lines as on them.

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