PapaDragon wrote:
They won't be concerned, USA already knows everything it wants about these export versions (China, Belarus)
This was taken into calculation when sales were made
I seriously doubt that....AFAIK, Belarussia doesn't operate S-400's to begin with and I won't even get into why China wouldn't share any data with the US
It would be simpler for USA to just buy new one from Russia, they would sell it no problem
Update:
Ankara will not be able to sell Washington S-400 air defense system without consent from Moscow , said the official representative of the Federal service for military-technical cooperation (FSMTC) Maria Vorobyova.
She explained that in order to export military products, the buyer of equipment must submit an end-user certificate to the Russian side, Interfax reports.
https://www.nakanune.ru/news/2020/07/01/22577554/
Also,
the press Secretary of the ruling party of Turkey noted that Turkey has no intention of selling the S-400 to the United States and there are no legal grounds for such a deal. Similarly, Turkey would not resell American weapons to 3rd countries.