They wil unveil their conclusions at a session of NATO Foreign to be held on Tuesday and Wednesday.
Turkey asked NATO to deploy as many as 6 Patriot batteries.
The deployment of NATO Patriot complexes in Turkey "is a concern to Russia and does not contribute to the stabilization of the already fragile situation" in the region, the President's Press Secretary, Dmitry Peskov, told reporters in Istanbul on Monday.
He noted that this issue will be addressed in today's talks. Peskov will accompany President Vladimir Putin during his visit to Istanbul. Shortly after his arrival in Turkey, Putin began closed-door talks with Turkey’s Prime Minister Recep Erdogan.
Voice of Russia, RIA