Crude oil loadings from Russia’s Sheskharis terminal at the Black Sea port of Novorossiysk were suspended on Friday following a drone attack.

Axar.az reports, citing Reuters, that the terminal, which handles around 700,000 barrels of crude per day, is Russia’s main oil export facility on the Black Sea.

One tanker scheduled to load at the port left for open waters after an attempted drone attack. The terminal then suspended loadings and stopped accepting oil after its storage tanks reached capacity, one source said.

The disruption adds to a series of attacks and interruptions affecting Russia’s Black Sea oil exports. Novorossiysk handles Russian Urals and Siberian Light crude as well as Kazakhstan’s KEBCO blend.