The attacks came during a renewed U.S. push to end the war that has raged for nearly four years and talks about a U.S. peace plan. Army Secretary Dan Driscoll met with Russian officials for several hours in Abu Dhabi on Tuesday, a U.S. official said.

Driscoll, who became part of the U.S. negotiating team less than two weeks ago, is heading up the latest phase of talks involving the terms of a possible peace settlement with Russia.

The U.S. official, who spoke on condition of anonymity to discuss sensitive negotiations, declined to give details on how long the negotiations would last or what topics were being discussed, but noted that the Ukrainians were aware of the meeting and all sides have indicated they wanted to reach a deal to halt the fighting as quickly as possible.

Ukraine's Pr

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