WASHINGTON, April 23 (UPI) -- Russia is increasing air defense systems and troop concentrations within eastern Ukraine, each a truce violation, the U.S. State Department said.
"The Russian military has deployed additional air defense systems into eastern Ukraine and moved several of these nearer the front lines. Russia is also building up its forces along its border with Ukraine. After maintaining a relatively steady presence along the border, Russia is sending additional units there," State Department spokeswoman Marie Harf said in a statement. The buildup contravenes a truce signed in Minsk in February.