Trump, Erdogan discuss working group on Russian S-400 - Aljazeera.com

1. Trump, Erdogan discuss working group on Russian S-400  Aljazeera.com
2. Trump, Erdogan discuss working group on Russian S-400 missile system  Reuters
3. US, Turkey play chicken over Russia | TheHill  The Hill
4. Ankara's realignment with Russia will cost Turkey more than it thinks | TheHill  The Hill
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