Abbas appears to be a man of great integrity which actually puts him at a bit of a a disadvantage in dealing with Israel which doesn't seem too interested in that particular virtue. The excessive generosity the US has paid to Israel has left it with a wholly spoiled mentality. Any final deal between the Palestinians and Israel will necessarily allow Israel to keep many of the illegal West Bank settlements that its "fact-on-the-ground" policy have made impossible to evacuate. Thus any final settlement will leave israel with this forever stain on reputation.
U.S., allies conduct 20 air strikes in Syria and Iraq against ISIS, says U.S. military (Reuters)
from the article: Abbas: I don't want to declare unilateral statehood