MOSCOW: Kazakhstan on Wednesday urged the US and Europe to help secure the transport of oil following drone attacks on tankers heading to a Black Sea terminal on the Russian coast which handles one percent of global supply.

Unidentified drones struck at least two oil tankers in the Black Sea on Tuesday, ⁠including one chartered by US oil major Chevron, as they sailed toward a terminal on the Russian coast to load oil from Kazakhstan.

Kazakhstan’s foreign ministry said in a statement that three tankers were hit en route to the marine terminal of the Caspian Pipeline Consortium (CPC) in the Black Sea. On November 29, drones also ⁠attacked CPC’s exporting equipment, resulting in a fall in oil exports via the outlet.

“The increasing frequency of such incidents highlights the growing risks to the functioning of international energy infrastructure,” the ministry said in a statement.

“We therefore call upon our partners to engage in close cooperation to develop joint measures aimed at preventing similar incidents in the future,” it added.