S-400 air-defence shields Russia from sky & space threats

Iran's relations with Russia have soured of late after Moscow cancelled a contract to deliver an advanced air defence system, the S-300. Much to Tehran's anger, the deal was torn up following the UN Security Council's arms embargo. Russia meanwhile has been developing the project further with an even more sophisticated version of the weapon - as RT's Egor Piskunov reports. RT LIVE http://rt.co ...