Historical, "Holy" Jerusalem never included the land East of the old city. For a couple of thousand years that area has been occupied, on and off, by non-Jews. If the price of peace, (actually, even if it isn't), is to cede that land to the Palestinian state in the making,what the hell is the problem.
Russia calls for international cooperation to fight ISIS (Reuters)
from the article: Clashes erupt as extreme rightists march through East Jerusalem