WATCH: As Russia strengthens grip over eastern Ukraine, U.S., Europe threaten diplomatic response.
Read more...Syria appears to be cooperating.
Read more...Syria has already begun fulfilling the agreement.
The United Nation's faces more unexpected obstacles as it attempts to reach a deal on Syria's chemical weapons.
Read more...The U.S. and Russia have a lot to work out to get Syria's weapons.
Read more...VIDEO: Russian Foreign Minister Sergei Lavrov called opposition's refusal to talk to Damascus a "dead end."
Read more...Dozens of civilians were reportedly killed Monday
Read more...Reactions around the world range from joyous to cautious.
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