(CNN)Marathon peace talks aimed at ending the bloody crisis in eastern Ukraine concluded Thursday in a breakthrough: A ceasefire that's due to start Sunday and an agreement for both sides to pull back heavy weapons.
If the ceasefire holds -- which is far from certain -- it could end a 10-month conflict that has claimed more than 5,000 lives, many of them civilians, and plunged East-West relations to their lowest point since the end of the Cold War.
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