A Mysterious Plot Prompts a Rare Call From Russia to the Pentagon

Earlier this month, Defense Secretary Lloyd J. Austin III received an unusual request from an unlikely caller: His Russian counterpart wanted to talk.

Since Russia invaded Ukraine in February 2022, Mr. Austin had spoken by phone with Russia’s defense minister only five other times, almost always at the Pentagon’s initiative and often in an effort to avoid miscalculations that could escalate the conflict.

In fact, Mr. Austin had reached out to Russia’s new defense minister, Andrei Belousov, just a couple of weeks earlier, on June 25, in an effort to keep the “lines of communication open,” the Pentagon said. It was the first phone call between the two men since Mr. Belousov, an economist, replaced Sergei K. Shoigu, Russia’s long-running defense minister, in a Kremlin shake-up in May.

Now on July 12, Mr. Belousov was calling to relay a warning, according to two U.S. officials and another official briefed on the call: The Russians had detected a Ukrainian covert operation in the works against Russia that they believed had the Americans’ blessing. Was the Pentagon aware of the plot, Mr. Belousov asked Mr. Austin, and its potential to ratchet up tensions between Moscow and Washington?

Pentagon officials were surprised by the allegation and unaware of any such plot, the two U.S. officials said, speaking on the condition of anonymity to discuss the confidential phone call. But whatever Mr. Belousov revealed, all three officials said, it was taken seriously enough that the Americans contacted the Ukrainians and said, essentially, if you’re thinking about doing something like this, don’t.

Despite Ukraine’s deep dependence on the United States for military, intelligence and diplomatic support, Ukrainian officials are not always