Turkish President Recep Tayyip Erdogan says the pressure against Ankara's purchase of S-400 air defence system is because "Turkey takes action with its own will regarding the regional developments, particularly Syria."
"Turkey does what is necessary for its own interests regarding the S-400 missile defense system, it makes its own decision," Vice President of Turkey Fuat Oktay says.
A report in a major publication alleges that Turkey is considering granting US defence companies access to Russian military know-how as part of its deal to buy the Patriot missile system from the US. Is this even a feasible scenario?
The Pentagon says it will reassess the promised delivery of F-35s to Turkey, but the report doesn't address Ankara's major concerns.
India has requested that the US grant it a waiver for the deal from sanctions prescribed by a US law passed in August 2017 that is intended to punish Russia for its annexation of Crimea and alleged interference in the 2016 US elections.
India is the world's biggest arms importer with Russia and the US as its largest and second largest supplier. Modi and Putin are also set to discuss space cooperation and a possible second Russian-built nuclear power plant in India.
A US State Department representative has urged "all of our allies and partners to forgo transactions with Russia that would trigger sanctions," as India and Russia plan to ink missile deal on Thursday, October 4.
"The value of the contract will be more than $5 billion," says Yury Ushakov, Russian President Vladimir Putin's top foreign policy aide.
Tensions escalate as Washington slaps financial sanctions on a Chinese military unit for purchasing Russian Sukhoi Su-35 fighter jets and S-400 surface-to-air missiles.
As relations between Turkey and the US reach new lows, Turkey is developing policies to counter financial speculation.
First two F-35 fighter jet delivered to Turkey during a ceremony in Forth Worth, Texas. Ankara plans to get 100 F-35 fighter jets in coming years, and as part of this deal 30 aircraft were ordered.
French newspaper Le Monde says it's seen a letter written by Saudi King Salman to French President Emmanuel Macron to express his "deep concerns" that Qatar is looking to purchase the air defense system, the S-400.
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