ANKARA: The removal of Turkey from the list of 鈥済lobal participants鈥� on the US F-35 joint strike fighter program鈥檚 official website carries political significance in terms of showing the Pentagon鈥檚 determination to push its NATO ally to make a final decision about its controversial purchase of a Russian air defense system.

Turkey鈥檚 contribution to the F-35 fighter jets鈥� supply chain was suspended following its receipt of parts of the S-400 surface-to-air defense system last July.

But the system has not yet been made operational, although Turkey has also refused to give up the S-400 completely. It even tested its radar system in Ankara against some of its air force鈥檚 US-made F-16 fighter jets last November.

However, the activation of the S-400 missile system that was scheduled for April is still delayed. Turkey has also been banned by the US from ordering F-35s for its air force.

The only condition for Ankara to become a contributor again and feature in the F-35 list is to move the system outside the country because F-35s cannot coexist with a Russian intelligence gathering platform that might detect their stealth capabilities and harm the long-term security of the alliance by spying on the jets.

Turkey鈥檚 industrial engagement in the F-35 program brought a significant economic boost to the country, with 10 contributing companies supplying more than 900 parts worth about $12 billion.

Lockheed Martin, as the prime contractor on the F-35 program, and the US government had to find new suppliers for the parts that were previously manufactured by Turkish companies.

But Turkey was cited until recently as one of the nine principal contributors on the program鈥檚 official website along with the US, Australia, Canada, Denmark, Italy, Netherlands, Norway and the UK.

A retired senior official from Turkey鈥檚 Foreign Ministry believed the country would delay the operation of the S-400, worth $2.5 billion, for a lengthy period due to economic and regional challenges.

鈥淯nder deepening conditions of economic recession, Ankara will not risk facing potential US sanctions in case it operationalizes the controversial Russian system,鈥� the official told Arab News. 鈥淢eanwhile, Turkish officials still have a slight hope to get credit opportunities from the US for overcoming its cash problems. It may force Ankara to think twice about not being eligible for sanctions.鈥�

Can Kasapoglu, a defense analyst from the Center for Economics and Foreign Policy Studies, said the country鈥檚 exclusion from the F-35 program was a great loss for the Turkish defense ecosystem.

鈥淢any aerospace firms were involved in the project with lucrative technology know-how gains and co-production opportunities,鈥� he told Arab News. 鈥淎ll these achievements were perfectly in league with Turkey's defense modernization priorities.鈥�

US senators are divided over whether they should downplay the S-400 issue, or further penalize Turkey over its Russia-inclined security reinforcement choices.

In a bid to alleviate the impasse between the two countries and get the Russian system out of Turkey, a US lawmaker proposed last week that the US buy Turkey鈥檚 S-400 through an amendment to the 2021 National Defense Authorization Act (NDAA).

This scenario, which was applied in 1997 by purchasing Moldova鈥檚 Russian-made Fulcrum fighter jets to keep them away from Iran, enables Ankara to take part in the F-35 program, but will at the same time antagonize Russia and harm the regional balance in Syria and Libya.

To alleviate Russian concerns about such a scenario, Turkey has pledged not to disclose any sensitive information it has related to the S-400 air defence system, as Defence Industries head Ismail Demir announced on Friday during a panel discussion.

However US Senate Foreign Relations Committee chairman, Jim Risch, introduced another harsher amendment that would mandate President Donald Trump鈥檚 administration to impose measures from the Countering America's Adversaries Through Sanctions Act (CAATSA) on Turkey within 30 days of the NDAA adoption because, under CAATSA, any nation procuring defense items from Russia should be subject to sanctions.

鈥淭he removal of Turkey from the list of global participants under the US鈥� F-35 joint strike fighter program鈥檚 official website is, as we say in Turkish, announcing what is already known, which is that Turkey is no longer part of the F-35 program,鈥� Ozgur Unluhisarcikli, Ankara office director of the German Marshall Fund of the United States, told Arab News.

He said that the move did not, however, prevent Turkey鈥檚 readmission to the program if and when the S-400 problem was resolved.