BRUSSELS

European Council President Antonio Costa warned against escalating tensions and breaches of bloc unity during discussions on Ukraine at Thursday's ongoing EU leaders' summit, according to an EU official familiar with the discussion.

Costa raised concerns over Hungary's stance regarding the EU's previously agreed financial support for Ukraine.

Addressing Hungarian Prime Minister Viktor Orban, Costa stressed that actions undermining collectively agreed decisions were "unacceptable," adding that it "violates the principles of good faith and of sincere cooperation enshrined in the treaties."

Hungary and Slovakia accuse Kyiv of failing to make sufficient efforts to ensure the continuation of oil shipments after they were disrupted due to an attack on the pipeline, which is critical to both countries.

According to the official who wished to remain anonymous, Costa stressed that the situation of the Druzhba pipeline is a "separate issue," adding that its restoration depends entirely on Ukraine's ability to repair it and on Russia's "willingness not to destroy it again."

At the same time, Costa addressed rising tensions between Kyiv and Budapest, noting that some public remarks by Ukrainian President Volodymyr Zelenskyy about Orban were also "unacceptable."

He stressed that "escalation is of no interest to anyone," according to the official.

During the Ukraine discussions of the ongoing summit, EU leaders reiterated their "firm and unwavering support" for Ukraine's sovereignty and territorial integrity, and confirmed continued political, financial, military, and humanitarian assistance, including a €90 billion ($103 billion) loan for 2026-2027, a press release by the EU Council noted.

They called for accelerating Ukraine's EU accession process, inviting the EU Council to open negotiation clusters without delay, it said.

The leaders also underlined their commitment to a "comprehensive, just, and lasting peace" based on international law, urging Russia to agree to an immediate ceasefire and engage in "meaningful" negotiations, the press release added.

It also highlighted the EU's intention to increase pressure on Russia, including moving forward with a 20th sanctions package and further measures targeting Moscow's energy revenues and financial system.

Hungary is vetoing the loan to Ukraine until oil flows resume via the Druzhba pipeline, while both Budapest and Bratislava are blocking the implementation of the 20th sanctions package against Moscow.