In the past, the North Atlantic Treaty Organization (NATO) justified its militarization of large swaths of Eastern Europe by pointing to the omnipresent threat of terrorism, or some 'rogue' foreign state, inherently understood to be Iran. Today the mask has slipped and it is no longer denied that NATO's primary target is Russia.
But first, a trip down nightmare lane. The road to ruin - at least as far as US-Russia relations were concerned - began immediately following the 9/11 terror attacks. Three months after that fateful day, in December 2001, George W. Bush informed Vladimir Putin that the US was withdrawing from the Anti-Ballistic Missile Treaty, a strange move considering that the treaty had kept the peace between the nuclear superpowers since 1972. This geopolitical "mistake," as Putin rightly defined it, allowed the US to begin the process of deploying a missile defense system, smack on the border with Russia, allegedly to shield the continent against an attack by Iran. Never mind the fact that Tehran had absolutely no reason, not to mention the wherewithal, to carry out such a suicidal mission. But Washington has never been one to let facts get in the way of a forced move on the global chess board.
Comment: See also: Iraqi interest in purchasing Russian S-400 missile systems leads to threat of sanctions from US