“There is need to talk about conditions, there are a series of issues that must be clarified” he told pro-government news channel NTV. He further ruled out the American Patriot defense systems as it currently stands, according to Turkish media reports. He further stated that "delivery process of S-400 to Turkey will start by July 2019 and the system will be active by October of 2019" in a staunch assertion sure to be noticed by the Pentagon.
The advanced S-400 air defense system purchased by Turkey has been seen as a threat by the United States, given the potential for compromising the F-35 advanced radar evading and electronics capabilities. The main argument for blocking the F-35 transfer is the fear that Russia would get access to the extremely advanced Joint Strike Fighter stealth aircraft, enabling Moscow to detect and exploit its vulnerabilities. Russia would ultimately learn how the S-400 could take out an F-35.
Erdogan reaffirmed that his country is moving forward at full speed to receive and install the Russian S-400, saying Monday: “We asked Western allies for the delivery of air defense systems, but the existing systems were withdrawn let alone giving a new one,” he said in reference to the US’s Patriot systems deployed in southern Turkey to protect its borders from threats of the Syria war.
While not naming the United States, he said “Turkey’s ally” was pressuring it to change its mind. He pointed out that the S-400 would in no way compromise its role in NATO, and that Washington was dealing unfairly with unreasonable expectations. At this point it appears each side is digging in its heals, likely leading to a future greater blowup in US-Turkey relations.