Sputnik News- Turkish President Recep Tayyip Erdogan said on Tuesday that Russia and Turkey have signed documents of S-400 air defense supplies.




The S-400 Triumph is�Russia's next-generation mobile surface-to-air missile systemcarrying three different types of�missiles capable of�destroying aerial targets at�a short-to-extremely-long range. It integrates a multifunctional radar, autonomous detection and targeting systems, anti-aircraft missile systems, launchers, and a command and control center.

On July 18, the head of�Russia's Rostec state corporation Sergei Chemezov said technical issues of�the contract for�the supply of�the�S-400 systemsto�Turkey had been resolved, with�only administrative ones remaining.

As of�now, Russia has concluded a contract for�the delivery of�the S-400 systems with�China alone. Negotiations are also being conducted with�India.

Earlier, US Department of�Defense spokesperson Capt. Jeff Davis�said in�a briefing�that the United States wants NATO allies to�have interoperable equipment, and Turkey would need to�explain for�itself the choice of�the Russian S-400 air defense systems.

"Turkey is a NATO ally, and one of�the cornerstone things that we like�to have with�any of�our allies�is the ability to�have equipment that interoperates," Davis told reporters. "The reports of�the S-400, and Turkey's purchase of�that, Turkey would need to�explain that for�itself."

Turkish President Recep Tayyip Erdogan�in�his turn�said that he saw no reason for�the United States' concerns from�in connection with�the Ankara-Moscow talks on�the purchase of�Russian S-400 air defense systems.

"Why should this be a concern? Each country should take certain measures to�ensure its security. Which side can ensure these measures, there the steps are taken. How many times have we talked with�America, but�it did not work out, so like�it or not, we began to�make plans about�the S-400. Our interested departments are negotiating, and this step will be taken," Erdogan said at�a press conference in�Ankara.