Russia, Turkey sign contract for second batch of S-400 air defence systems — TASS
- Russia, Turkey sign contract for second batch of S-400 air defence systems — TASS WKZO
- Russia, Turkey Spar Over Air-Defense Sale That US Opposes Bloomberg
- Turkish official casts doubt on report of new Russian air defence sale Reuters
- No new deals between Turkey and Russia for S-400 system, Turkish official says Reuters
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