The European Union’s chief diplomat has called for all sides in the Middle East conflict to “step back” and return to negotiations after the U.S. struck key Iranian nuclear facilities on Saturday.

Kaja Kallas posted on the X platform that an Iranian nuclear capability would represent a global security threat and urged all sides not to escalate.

“I urge all sides to step back, return to the negotiating table and prevent further escalation,” she wrote, adding that EU foreign ministers will meet on Monday to discuss the latest developments.

The U.S. entered a conflict on Saturday that has raged between Israel and Iran since June 13 when Tel Aviv launched airstrikes against Iranian nuclear and military targets.

Since then, the two sides have exchanged air attacks resulting in hundreds of deaths and injuries.

Having said on Thursday he would decide within two weeks whether to enter the fray, U.S. President Donald Trump authorized a heavy assault on three Iranian nuclear development facilities on Saturday and warned of further action should Tehran retaliate.

Against the backdrop of escalating hostilities in the Middle East, Poland’s foreign ministry advised on Sunday against all travel to Israel.

Spokesman Paweł Wroński told a press conference the ministry is not a “travel agency” after Polish authorities repatriated around 200 people from Israel last week.

“It is not the case that we will always be able to help people.” he said.