It's ALL THINGS CONSIDERED from NPR West. Arun Rath is away. I'm Tess Vigeland. The crisis in Eastern Ukraine seems to be worsening. The government in Kiev says it is prepared for a large-scale assault on separatists who have taken over government buildings in cities near the Russian border. Clashes between pro-Russian forces and the Ukrainian government turned deadly in the City of Slavyansk. NPR's Ari Shapiro is in Donetsk and he joins us now with the latest. Ari, tell us what happened overnight.