The White House says a new peace deal between Russia and Ukraine could be a significant step toward peacefully resolving the conflict. White House press secretary Josh Earnest is calling on all sides to follow through with immediate and concrete steps. Earnest says the cease-fire must be honored and heavy weapons withdrawn. He’s also calling on Russia to stop supporting the separatists and withdraw its troops and equipment from eastern Ukraine. The White House says Ukraine’s border with Russia must be restored and that the US is especially concerned about fighting that escalated Thursday despite the agreement.