Business Insider: Turkey may soon put its controversial Russian S-400 air defenses in operation
Turkey may deploy its Russian S-400 Triumf air defenses on the Iraqi border - US officials have warned Turkey against "activating" it
Nordic Monitor: Turkey put Russian S-400 missiles in a storage facility to avoid further clashes with the US
The revelation that the missiles are stored at an unknown location was made in a speech by Defense Minister Hulusi Akar in parliament on November 22
Russia to install radar & missile systems close to critical NATO facilities in Turkey, prompting security concerns
The government of President Erdogan has not been forthcoming with details of the plant construction, which is estimated to cost some $20-$22 billion