S-400

The action will indicate the official Full Operational Capability (FOC) status of the system as Turkey is gearing up for military confrontation

Philip H. Gordon, a foreign policy adviser and former assistant secretary of state: “Ιt’s getting hard to describe Turkey as an ally of the US”

Engineers & workers began ringing alarm bells over a potential nuclear disaster & NGOs filed a lawsuit demanding the construction to stop

Relations between Ankara and Moscow have cooled since the killing of Turkish soldiers in a government attack in Idlib

The system has unofficially achieved FOC (Full Operational Capability) but for diplomatic reasons the official announcement has been postponed

Turkey’s deepening economic woes are widely seen as one -but not the only- reason behind the delay the activation of the S-400s

The North American country is not the only state to enforce an arms embargo on Turkey following the military operation last year

Turkey’s acquisition of two Russian-supplied SAM systems remains a source of friction between the two NATO allies

Turkey hopes the system will be operational by April, a major turning point in Turkey-Russia relations

Senior US official says that S-400 acquisition "challenged membership in NATO"