GENEVA (AP) — Syria has agreed to allow humanitarian workers and supplies into four of its provinces hit hardest by violence, a promise of some relief in a nation where 1 million people need aid urgently due to the fighting, officials said Tuesday.

At the same time, however, Damascus plunged itself into further international isolation by labeling U.S. and European envoys as unwelcome in retaliation for earlier Western expulsions of Syrian diplomats.