Small point: In first graf, "The demands made by the U.S. and other world powers . . . is unreasonable" should be "The demamds made by the U.S. and other world powers . . . ARE unreasonable." Plural subject requires plural verb. Regards.
Western-backed Syrian rebels say kill foreign Islamic State (Reuters)
from the article: Lieberman: U.S. demand to end East Jerusalem building is 'unreasonable'