NATO Secretary General Jens Stoltenberg expressed "serious concerns" on Friday about Turkey's ongoing operation against Kurdish forces in Syria and called for "restraint".
"I shared... my serious concerns about this ongoing operation and the risk of further destabilisation of the region," Stoltenberg told reporters in Istanbul, speaking alongside Turkish Foreign Minister Mevlut Cavusoglu.
"While Turkey has serious security concerns, we expect Turkey to act with restraint."
"Turkey tried diplomacy till the very last moment. Since it didn't work, we have to eliminate the threat."