A U.S. official told ABC News on Tuesday that a Ukrainian delegation has agreed with the United States on the terms of a potential peace deal.

United States Army Secretary Dan Driscoll held secret talks on Monday with a Russian delegation in Abu Dhabi in the United Arab Emirates to follow up on this weekend's talks with Ukraine in Geneva that were intended to move the Ukraine peace process forward, a U.S. official told ABC News.

"The Ukrainians have agreed to the peace deal," the U.S. official said. "There are some minor details to be sorted out but they have agreed to a peace deal."

The previously undisclosed talks with the Russian delegation on Monday follow the talks held in Geneva this past weekend between the U.S. and Ukraine and are the latest indication that the new U.S. initiati

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