Ukrainian military officials on Thursday expressed confidence in their ability to hold onto Bakhmut, even as military analysts and Western officials warned that the battle was unsustainable. Poland on Thursday said it had detained nine foreigners accused of spying for Russia and preparing operations to disrupt the flow of Western arms into neighboring Ukraine.

Ukraine’s military reported unusual Russian naval activity in the Black Sea on Thursday, saying more ships were deployed in its waters in a scattered formation that suggested they were searching for the wreckage of the U.S. The fallout from a collision between a Russian warplane and an American spy drone continued, as the Pentagon’s European Command on Thursday released the first declassified video images of the events leading up to the episode, which has threatened to escalate tensions between the United States and Russia amid the war in Ukraine. Poland’s announcement “doesn’t change our calculus, with respect to F-16s,” Mr.

Kirby, said that the United States still had no plans to send American-made warplanes to Ukraine.

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