While the billionaire businessman isn't a Cabinet member, Trump has publicly embraced Musk and his brainchild, the Department of Government Efficiency.

Ukraine signed an agreement wherein it would dispose of its nuclear weapons arsenal—then the world’s third-largest—in exchange for a guarantee by the U.S., U.K. and Russia to provide the country with ...

Ukraine has considerable leverage in upcoming negotiations with Russia—as long as the United States stands by Kyiv and adopts a negotiating strategy that creates real dilemmas for Moscow. U.S. support ...