Russia signaled it would take a hard line during Ukraine talks Monday, calling on Kiev to agree to an immediate and unconditional cease-fire as President Vladimir Putin accused Ukraine’s leaders of escalating the violence by refusing to negotiate in good faith. In Kiev, Ukrainian President Petro Poroshenko accused Russia of undertaking “undisguised aggression” that has “fundamentally changed the situation in the zone of military action” in the east, where Ukrainian forces have been fighting pro-Russia separatists for five months. Kiev, backed by Western leaders, has accused Moscow of sending more than 1,000 troops into its territory in the last few weeks to support the separatists, a charge Moscow denies even as Ukraine has suffered a dramatic reversal on the battlefield in recent days. The rebel representative to Monday’s talks with Russia […]