Slovak Prime Minister Robert Fico has issued Ukraine a two-day deadline to resume the pumping of Russian oil through its territory, threatening to cut off electricity to the war-torn country if this demand is not met.

Fico issued his ultimatum to Ukrainian President Volodymyr Zelenskyy on Saturday, warning on X that he would ask state-owned company SEPS to halt emergency supplies of electricity if flows of Russian crude via the Soviet-era Druzhba pipeline crossing Ukraine are not resumed by Monday.

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Slovakia and neighbouring Hungary, which have both remained dependent on Russian oil since the Kremlin launched its invasion of Ukraine almost four years ago, have become increasingly vocal in demanding Kyiv resume deliveries through the pipeline, which was shut down after what Ukraine said was a Russian drone strike hit infrastructure in late January.

The Slovak leader accused Zelenskyy of acting “maliciously” towards his country, alluding to Ukraine’s earlier halting of Russian gas supplies after a five-year-old transit agreement expired on January 1, 2025, which he claimed is costing Slovakia “damages of 500 million [euros; about $589m] per year”.

Describing Zelenskyy’s actions as “unacceptable behaviour”, he said that his refusal to “involve the Slovak Republic in the latest 90 billion euros ($105bn) military loan for Ukraine” had been “absolutely correct”.

Slovakia is a major source of European electricity for Ukraine, needed as Russian attacks have damaged its grid. Energy sector experts say Slovakia provided 18 percent of record-setting Ukrainian electricity imports last month.

EU loan in peril

Hungary, Slovakia and the Czech Republic all opposed the interest-free European Union loan package, which was agreed to by the bloc’s member states back in December to help Ukraine meet its military and economic needs over the coming two years.

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While the three nations opposed the package, which replaced a contentious plan to use frozen Russian assets that ran aground over legal concerns, a compromise was reached in which they did not block the initiative and were promised protection from any financial fallout.

However, as tensions mounted over the interrupted supply of Russian oil this week, Hungarian Prime Minister Viktor Orban threatened on Friday to overturn December’s deal by vetoing the EU loan package.

“As long as Ukraine blocks the Druzhba pipeline, Hungary will block the 90‑billion-euro Ukrainian war loan. We will not be pushed around!” the Hungarian leader wrote on Facebook.

Slovakia and Hungary both received a temporary exemption from an EU policy prohibiting imports of Russian oil over the war in Ukraine.

Ukraine responds

The Ukrainian Ministry of Foreign Affairs slammed Slovakia and Hungary on Saturday for what it called their “ultimatums and blackmail” over energy issues, saying the two countries are “playing into the hands of the aggressor [Russia]”.

The ministry said that Ukraine had provided information on the damage that resulted from “Russian attacks” on the Druzhba pipeline to Hungary and Slovakia, and that repair work is under way.

In the meantime, it said, it has “also proposed alternative ways to resolve the issue of supplying non-Russian oil to these countries”.