U.S. and Russia trade sanctions over Crimea
U.S. and Russia trade sanctions over Crimea

WASHINGTON — The U.S. and Russian presidents imposed sanctions on each other's top aides and other government officials Thursday as the dispute over Crimea intensified and the White House worried publicly that Moscow might be positioning its military to seize more of Ukraine. Denouncing Russia's annexation of Crimea, President Obama said the Treasury Department would freeze any U.S. assets of 20 prominent Russians — including several officials close to President Vladimir Putin, some of the country's wealthiest businessmen — and a Moscow bank that gives financial support to the Russian leadership. Saying the "world is watching with grave concern," Obama also warned that he was prepared to...