MOSCOW—A stop-fireplace among Ukrainian federal government forces and Russian-backed separatists took impact on Monday, giving the prospect of an close to a slow-burning conflict that has claimed thousands of lives in Japanese Ukraine and grow to be a flashpoint among Moscow and the West.

Presidents Vladimir Putin of Russia and Volodymyr Zelensky of Ukraine spoke hrs in advance of the armistice was scheduled to enter into pressure, their offices stated. The settlement, negotiated previous week by Ukraine, Russia and the Group for Protection and…