Hungary has repeatedly seen its oil supplies via the Druzhba pipeline disrupted as Kyiv, fighting off Moscow’s invasion, targets Russian energy infrastructure.

Relations between Kyiv and Budapest have plummeted since Moscow launched its invasion three years ago, with Hungary’s nationalist leader Viktor Orban maintaining ties with the Kremlin and frustrating Kyiv’s efforts to join the EU.

Kyiv summoned the Hungarian ambassador to give him “a protest note,” foreign minister Andrii Sybiha said.

“We urge Hungary to further refrain from unfriendly actions and instead engage in constructive dialogue, for which Ukraine remains ready,” he said on X.

Earlier Thursday, Hungary’s foreign minister Peter Szijjarto said his country was issuing an entry ban against the Ukrainian military commander who carried out “an attack on Hungary’s sovereignty, endangering our energy security”.

Robert Brovdi, an ethnic Hungarian who commands Ukraine’s drone forces, said he was the one facing the ban.

On Telegram, he dismissed Budapest’s “sanctions and restrictions”, adding that “your hands are covered in Ukrainian blood. And we will remember that”.

Ukrainian President Volodymyr Zelensky also denounced Hungary’s move, saying that the entry ban “can only cause outrage”.

The announcement came after a massive Russian attack on Ukraine overnight killed at least 19 people, including four children, in one of the deadliest on Kyiv.

Last week, Orban said he had complained to US President Donald Trump after Ukraine’s military operations against Russia disrupted oil supplies.

Hungary as well as Slovakia have also asked the European Commission to act against Ukraine’s “repeated attacks” on the Druzhba oil pipeline.

The EU imposed a ban on most oil imports from Russia in 2022, but the Druzhba pipeline was exempted to give landlocked Central European countries time to find alternative oil supplies.

Orban and his Slovakian counterpart Robert Fico have denounced the sanctions as threatening their countries’ energy security.