The supply of Russian oil to Slovakia through the Druzhba pipeline crossing Ukraine has resumed, Slovak Economy Minister Denisa Saková said on Thursday.
The flow restarted at 2 a.m. on Thursday after remaining suspended for about three months.
Hungary and Slovakia have been in an escalating dispute with Ukraine since Russian oil deliveries to both countries were halted in January.
Unlike most European Union members, Hungary and Slovakia still rely heavily on Russian energy supplies.
Both countries have accused Ukraine of not repairing damage to the pipeline. Hungary has blocked a large European Union loan intended for war-hit Ukraine, while Slovakia had refused to support new sanctions against Russia until oil supplies resumed.