U.S. Army Secretary Dan Driscoll held discussions with Russian officials in Abu Dhabi on Monday, according to a U.S. official familiar with the matter, marking the latest attempt by the Trump administration to revive momentum toward a negotiated settlement in the ongoing Russia-Ukraine war. The meetings were described as part of a broader diplomatic effort aimed at narrowing longstanding divisions between Moscow and Kyiv, which have intensified despite repeated international appeals for de-es