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By Pavel Polityuk and Polina Devitt KIEV/MOSCOW (Reuters) - Ukrainian President Petro Poroshenko accused Russia on Monday of "direct and open aggression" which he said had radically changed the battlefield balance as Kiev's forces suffered a further reverse in the war with pro-Moscow separatists. Ukraine's military said its troops had been ordered to pull back from a vital airport in the east of the country, near the city of Luhansk, where they had been battling a Russian tank battalion. Poroshenko said in a speech there would be high-level personnel changes in the Ukrainian armed forces, whose troops fled a new rebel advance in the south which Kiev's Western allies say has been backed up by Russian armored columns. Russian President Vladimir Putin, who called on Sunday for immediate negotiations on the "statehood" of southern and eastern Ukraine, blamed Kiev's leadership for refusing to enter into direct political talks with the separatists.
MOSCOW (AP) — Diplomats at a new round of talks on easing the crisis in Ukraine must push for an immediate, unconditional cease-fire between Ukrainian government troops and pro-Russian separatists, Russia's foreign minister said Monday.