KIEV, Ukraine (AP) — Ukrainian President Petro Poroshenko tried to keep his peace plan to settle the conflict with pro-Russian separatists on track in a four-way phone call Sunday with Russian President Vladimir Putin and the leaders of France and Germany.

The two-hour conversation came ahead of a Monday deadline that European Union leaders set for Russia and the separatists to take steps to ease the violence, warning that otherwise they were ready “at any time” to impose further punitive measures.