The U.S. on Thursday imposed sanctions on a network of more than a dozen people and firms that are accused of facilitating the shipment of millions of barrels of Iranian oil to China.

Congolese security forces have tried to slow the advance of Rwanda-backed M23 rebels who say they have captured Goma after entering eastern Congo’s largest city.

The Philippine coast guard says Chinese coast guard ships and a Chinese navy helicopter harassed a group of Philippine fisheries vessels conducting a scientific survey in a hotly disputed area of the South China Sea, forcing them to cancel the operation.

Secretary of State Marco Rubio will make his first official trip abroad next week to Central America.