US Senator questions Turkey’s commitment to NATO over S-400 missile purchase
Turkey rejected a U.S. offer to be given the Patriot anti-aircraft system on favourable terms if it abandoned plans to purchase the S-400 missile systems
US threatens Turkey with “grave consequences” over S-400 missile deal
US Pentagon official advised Ankara to seek better solutions
Russia suspends INF Treaty with US
The INF Treaty came into force in 1988 banning the Soviet Union & the US from developing & deploying ballistic missiles with ranges between 500 & 5.500 km