U.S. Army Secretary Dan Driscoll is in Abu Dhabi to meet with Russian officials, two U.S. officials and two diplomatic sources who were not authorized to speak publicly told CBS News.

"Secretary Driscoll met with members of the Russian delegation [Monday night] for several hours in Abu Dhabi. He is scheduled to meet with them again throughout the day [Tuesday] to discuss the peace process and rapidly move the peace negotiations forward," a U.S. official told CBS News.

It is not clear who else is in the U.S. delegation in Abu Dhabi.

The meetings come amid an intensifying push by President Trump to secure a ceasefire in the almost four-year-long Russia-Ukraine war, with U.S. officials holding discussions with envoys from both countries.

Over the weekend, Driscoll, Secretary of State

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