KIEV, Ukraine (AP) — Ukraine’s new president said Monday that he will propose a detailed peace plan this week that will include a cease-fire with the separatist rebels in the country’s restive east.

But first, the armed forces must secure control over Ukraine’s porous border with Russia, President Petro Poroshenko said at a meeting of the national security council after a bloody weekend in which the rebels shot down a military transport plane, killing 49 crew and troops.