Iran and the US deadlocked ahead of Trump’s China trip

The volatility could tip the Middle East back into open warfare and prolong the worldwide energy crisis sparked by the conflict

Donald Trump is due to meet his Chinese counterpart (AP)

Iran and the United States have reached a fresh impasse over how to end their war.

A current ceasefireis increasingly shaky, with the two sides exchanging fire in recent days with ships and Gulf states being targeted, and fighting flaring between Israel and the Lebanese militant group Hezbollah.