Russia launched a wave of attacks on Ukraine`s capital, Kyiv, overnight, with at least seven people killed in strikes that hit city buildings and energy infrastructure. A Ukrainian attack on southern Russia killed three people and damaged homes, authorities said.

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. U.S. Army Secretary Dan Driscoll met with Russian officials for several hours in Abu Dhabi, United Arab Emirates, on Tuesday, a U.S. official told The Associated Press.

Driscoll, who became part of the American 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.

Oleksandr Bevz, one of the Ukrainian delegates at Sunday`s talks between the U.S. and Ukraine in Geneva, said that the numbers of points in the proposed settlement was reduced, but he denied reports that the 28-point U.S. peace plan now consisted of 19 points.

"(The document) is going to continue to change. We can confirm that it was reduced to take out points not relating to Ukraine, to exclude duplicates and for editing purposes," Bevz told The Associated Press, adding that some points relating solely to relations between Russia and the U.S. were excluded.