buy a house, on a piece of land with temporary property lines. Why should I improve/landscape that piece of land, knowing that the property owner surrounding me can drive his tank across it any time he wants. A simplistic analogy but very close to the truth of the situation.
U.S. says working on initiative to de-escalate Syria fighting, with focus on Aleppo (Reuters)
from the article: Abbas urges Obama to impose Mideast peace solution