When the Ukrainian navy command ship was close enough to Russia’s shore to get the country’s state television channels, Capt. Oleksandr Hryhorevskyi switched on the news and wondered: Why all the fuss about his rusty old boat? The appearance of his more-than-50-year-old vessel — aptly named Donbas, for the eastern …

U.S. officials say intelligence sharing is essential to the Ukrainian government’s survival, even as they try to avoid escalating the situation. The Pentagon is working on a plan to provide Ukraine with battlefield intelligence that could help the country more quickly respond to a possible Russian invasion, senior administration officials …

Eastern European nations have drawn a lesson from America’s wars of the last decades: Insurgency works. Ukraine’s training of volunteers has become a factor in the standoff with Russia. In a pine forest not far from Ukraine’s capital, a mock battle raged. Commanders barked orders. Figures in camouflage huddled behind …