PBS NewsHour producer Morgan Till is documenting his journey with chief foreign correspondent Margaret Warner across Ukraine on Twitter. Today they are watching as voters throughout the Crimean Peninsula post ballots on a local referendum to decide whether the region…

WASHINGTON — The White House says that if Russian President Vladimir Putin doesn’t back down in Crimea, he will face penalties from the West that will hurt the Russian economy and diminish Moscow’s influence in the world. White House senior…

The future of the Ukrainian region of Crimea hangs in the balance of Sunday’s referendum vote on whether to secede and possibly join Russia. Chief foreign affairs correspondent Margaret Warner reports from Crimea, where she talks to the pro-Russian and…