Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].

MOSCOW (Reuters) - Russia will supply Turkey with four batteries of S-400 surface-to-air missiles for $2.5 billion under a deal that is almost complete  Sergei Chemezov  head of Russian state conglomerate Rostec  told the Kommersant daily on Wednesday.
Turkey will pay 45 percent of the cost up front with Russia providing loans to cover the remaining 55 percent   Chemezov  said. Moscow expected to begin the first deliveries in March 2020   he  said.
 Chemezov  told Kommersant that Turkey was the first NATO member state to acquire the advanced S-400 missile system.
 He  said the Russian and Turkish finance ministries had already completed talks on financing the deal and that the final documents just needed to be approved.
Russia to supply Turkey with four S