Hungary maintained its veto on Monday on new EU sanctions on Russia and a huge loan for Ukraine amid a dispute over oil supplies, in a blow to Europe’s pro-Ukrainian consensus on the eve of the war’s fourth anniversary.

On the ground in Ukraine, Kyiv claimed a rare frontline advance, though Moscow continued its campaign of targeting Ukrainian cities, killing two people in drone strikes in the south.

The diplomatic spotlight was on Brussels, where European foreign ministers tried unsuccessfully to persuade Budapest not to punish Ukraine for delays restarting the flow of Russian oil to Hungary via a Soviet-era pipeline.

Soon after, another of Ukraine’s EU neighbors, Slovakia, said it would refuse any requests from Kyiv for emergency electricity supplies from Monday until oil flows resume via the Druzhba pipeline.

Potentially escalating the crisis further, Ukraine said its drones struck a Russian pumping station overnight serving the pipeline. It was set up to supply Moscow’s crude through Ukraine to eastern Europe, but shipments to Slovakia and Hungary have been cut off since January 27.

‘This Is a Setback,’ Says EU’s Kallas

“We have not reached an agreement on the 20th sanctions package,” EU foreign policy chief Kaja Kallas told reporters. “This is a setback and a message we didn’t want to send today, but the work continues.”

European Council President Antonio Costa urged Hungarian Prime Minister Viktor Orban to honor an EU deal for a 90 billion euro ($106.11 billion) loan to Ukraine.

But he replied in a letter seen by Reuters that Ukraine could restart the oil flows if it wanted and: “I am not in a position to support any decision whatsoever favorable to Ukraine until they return to normality.”

Ukraine says the oil flows stopped after a Russian attack on pipeline infrastructure in January and it is fixing the damage as fast as it can.

But Slovakia and Hungary – who have the EU’s only two refineries that still rely on oil via Druzhba – say Ukraine is to blame for the outage, in one of the angriest disputes yet between the three neighbors.

Hungary and Slovakia both have leaders who have bucked the European consensus by maintaining close relations with Moscow, but have previously stopped short of blocking EU sanctions on Russia or loans to Ukraine.

Ukraine Claims Frontline Gain

Russian President Vladimir Putin’s decision to send his forces into Ukraine on February 24, 2022, triggered Europe’s deadliest conflict since World War Two. Russian forces have killed tens of thousands of Ukrainian civilians and destroyed Ukrainian cities. Hundreds of thousands of soldiers on both sides have died or been wounded.

In the war’s first year, Ukraine forced back the Russian offensive at the gates of Kyiv and reclaimed swathes of occupied land. But a Ukrainian counteroffensive failed the following year, and since then Moscow has made slow but relentless gains in costly battles along a 1,200-km (750-mile) front.

In a rare announcement of a Ukrainian advance, the commander-in-chief of Ukraine’s armed forces, Oleksandr Syrskyi, said on Monday his forces had “restored control” over 400 square km of territory along a stretch of the southern frontline.

Reuters was not immediately able to confirm the claim, and there was no immediate response from Moscow. If true, it would be the first big Ukrainian gain since December and one of the biggest in many months.

The U.S. has been trying to broker a peace deal between Russia and Ukraine, but progress has proved elusive. Their most recent talks, in Geneva on February 17 and 18, did not produce a breakthrough.

Another round of talks aimed at ending the war in Ukraine could be held at the end of this week, President Volodymyr Zelenskiy’s chief of staff told Ukrainian media on Monday.

As President Donald Trump has steered the United States away from providing military and financial support for Ukraine, European countries have increasingly stepped in. But the threats from Slovakia and Hungary put that consensus in jeopardy.

Four diplomats in Brussels told Reuters that Hungary’s Foreign Minister Peter Szijjarto drew sharp criticism from EU colleagues behind closed doors in Brussels, with some ministers accusing Orban’s government of using the issue for political gain ahead of a tough election in April.

Russia Hits Odessa

Russia has been relentlessly targeting Ukraine’s power grid and energy system in nightly drone and missile attacks, arguing such infrastructure is a legitimate target because it helps the war effort. Kyiv, which has also struck Russian oil infrastructure, says Moscow’s aim is to break the national will by freezing Ukrainians in their homes.

Ukraine’s emergency services said two people were killed and three wounded overnight in the latest drone attacks that hit the southern Odesa region. Ukraine’s Infrastructure Minister Oleksiy Kuleba said Russia had attacked port infrastructure there.

Russian state news agency RIA, citing the country’s Defense Ministry, said Moscow’s forces had carried out successful strikes on Ukrainian transport, energy and fuel infrastructure.

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(Reporting by Lili Bayer, Kate Abnett, Julia Payne and Andrew Gray in Brussels, Pavel Polityuk and Max Hunder in Kyiv, Anna Pruchnicka in Gdansk, Bart Meijer in Amsterdam, Friederike Heine in Berlin, Krisztina Than in Budapest, Jason Hovet in Prague, Pawel Florkiewicz in Warsaw; Writing by Alan Charlish and Michael Kahn, Editing by Gareth Jones, Peter Graff and Andrew Heavens)