US, Turkey remain divided over purchase of Russia’s S-400s

https://www.defensenews.com/global/europe/2021/03/25/us-turkey-remain-divided-over-purchase-of-russias-s-400s/

Turkey argues that the Russian system, which cost it $2.5 billion, is not a threat to NATO, and has repeatedly called for dialogue to resolve the issue.

https://peterholland765.wordpress.com/2021/03/25/us-turkey-remain-divided-over-purchase-of-russias-s-400s/