The world’s two biggest economies agreed to a temporary rollback of most of their recent levies after negotiating in Switzerland over the weekend.

Both sides are hailing the temporary reprieve, which will cut U.S. duties on Chinese goods to 30 percent, but analysts say underlying issues remain.

Top US officials involved in high-level trade negotiations with China emerged from two days of talks touting “substantial progress” and appearing to confirm that a deal between the two countries had been reached,