See http://www.bbc.co.uk/news/world-europe-31463007 .
See http://www.bbc.co.uk/news/world-europe-31470645 .
The president of Ukraine is worried that the peace deal may not hold. It will require some trust and faith by both sides. Such moves are never easy, but peace is so much better than war.
I have no idea who is the real aggressor in this: clearly the Russian's are acting suspiciously. At the same time some in the Russian speaking east want closer ties with Russia. A fair peace deal needs to ensure the will of all the people is respected.
Already it is estimated that around 5400 people have died as a result of the conflict.