Tensions with Russia remain high over the Kremlin-backed insurgency in eastern Ukraine. The annual Rapid Trident military exercises, now taking place in the western Ukraine village of Starychi, involve 2,200 soldiers from 14 countries. US Ambassador to Ukraine Marie Yovanovitch said the participants stand in solidarity with Ukraine, for Ukrainian security, sovereignty, and territorial integrity. Some 350 pieces of military equipment will be used during the exercises. The Ukrainian Border Guard Service and National Guard troops will be involved for the first time.