European Commission President Jean-Claude Juncker has warned the United States that there would be “war in the Balkans” if the EU collapses.

The website is reporting this, citing Juncker’s exclusive interview to the Financial Times during which he revealed details of his conversation with US Vice President Mike Pence, that took place in Brussels on February 20.

The EU official said he was upset and surprised by US President Donald Trump’s enthusiasm over Brexit, and warned Americans about the consequences of such behavior.

“I told the vice-president, ‘Do not say that. Do not invite others to leave, because if the European Union collapses, you will have a new war in the Western Balkans,” Juncker said.

“If we leave them alone – Bosnia-Herzegovina, Republika Srpska (Serb Republic), Macedonia, Albania, all those countries — we will have war again,” Juncker, who thinks it is “important to offer countries in the region the prospect of EU membership,” said.