The attack on Friday, which killed at least four people nationwide, came two days after Russia vowed retaliation for an audacious drone assault on its strategic bomber bases.
President Trump spoke with President Vladimir V. Putin of Russia amid escalating attacks between Russia and Ukraine, even as their officials have been engaged in direct talks.
In a photo distributed by Russian state media, President Vladimir V. Putin holds a video meeting with government officials on Wednesday at the Novo-Ogaryovo state residence outside Moscow.
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