NATO envoys to meet Tuesday over downed Turkish jet

"Turkey has requested consultations under article 4 of NATO's founding Washington Treaty. Under article 4, any ally can request consultations whenever, in the opinion of any of them, their territorial integrity, political independence or security is threatened," Oana Lungescu said.

"The NAC (North Atlantic Council) will meet on Tuesday at Turkey's request. We expect Turkey to make a presentation on the recent incident."

A NATO diplomat said Turkey was likely to give NATO allies details. "It is up to to Turkey and the allies to decide how they want to proceed," the diplomat said.

"What Turkey may need is political support. We haven't had any other request... It doesn't necessarily lead to the next step.

"It's important that allies show solidarity and concern."