Cambodia and Thailand exchanged fire across their disputed border for a fourth day on Sunday, hours after US President Donald Trump announced the two Southeast Asian nations had agreed to ceasefire talks and threatened continued fighting would jeopardize their trade deals with Washington.

Cambodian Defense Ministry spokesperson Lt. Gen. Maly Socheata accused Thai forces of escalating the violence with bombardment of Cambodian territory early Sunday, followed by a “large-scale incursion” involving tanks and ground troops in multiple areas.

After days of deadly border clashes that have left 34 people dead and displaced over 168,000, there are new signs of hope emerging from Southeast Asia. Mediation efforts led by former U.S. President Donald Trump appear to have prompted Cambodia and Thailand to take initial steps toward peace,