BRUXELLES, NEW DELHI (Reuters, WION) — Germany’s defence minister presented to NATO her proposal for a security zone in northern Syria on Thursday, receiving support from Turkey and the United States but also a warning from the alliance’s chief that it may need to involve the United Nations.

Annegret Kramp-Karrenbauer told allies that an internationally controlled zone would also need Russia, now the dominant power in Syria, if it was to protect displaced civilians and ensure the fight continues against Islamic State militants, diplomats said.

However, she insisted at the meeting of NATO defence ministers in Brussels that the task of patrolling the Turkish-Syrian border could not fall to Russia and Turkey alone, telling reporters: “The status quo is not a satisfactory solution.”

U.S. Defence Secretary Mark Esper, in Brussels on Thursday, said the Turkish incursion was “unwarranted”.