Reuters could not independently verify the reports. There was no immediate comment from Russia.

The transit pipeline delivers Russian oil to Hungary and Slovakia, which continue to buy energy supplies from Russia, even after other EU nations cut ties following its invasion of Ukraine in 2022.

A spokesman for Hungarian refiner MOL said that crude oil deliveries to the country were running on schedule.

A spokesman for Slovak pipeline operator Transpetrol did not immediately respond to an emailed request for comment.

Kyiv says its strikes on Russian energy targets, in response to Moscow’s continued attacks on Ukraine, aim to undermine the adversary’s overall war effort.

Oil shipments to both countries have been disrupted several times in recent weeks by Ukrainian attacks on the pipeline, which runs from Russia through Ukraine to reach Slovakia.