Russian oil supplies to Hungary and Slovakia could be suspended for at least five days after a Ukrainian strike on a facility in Russia, Hungarian and Slovakian officials said on Friday, in a widening of the fallout of Russia's war in Ukraine.

A Ukrainian drone strike on Russia's Druzhba oil pipeline has disrupted supplies to Hungary and Slovakia, sparking outrage in the two European countries that still purchase Russian oil through the pipeline.

Russia and Ukraine have stepped up attacks on each other’s energy infrastructure, hitting Ukrainian domestic heating supplies, Russia’s Druzhba pipeline and other facilities, over the past few weeks as US President Donald Trump has pushed for a deal to end the conflict.