The last thing im aware , Russia was testing/working with nukes armed missiles was ICBM with multi entry warheads but that the warheads on itself are hypersonic missiles,not just warheads that fall on different places and move by gravity, but mini hypersonic missiles that operate independently of each other and can be programed to target any specific target.. in this case.. the ICBM.. becomes more like a transportation launcher and not a missile. And the Missiles are stored inside in the warhead.. Rogozing was praising the last test they did end 2013 ,saying the west have nothing like that. am i right?
So this are the things i think Putin could be mentioning..
MARV ( maneuvering re-entry vehicle ) that fly independently of each other and are launched not from land or sea..but they launched from the warhead of an ICBM while it have been launched.. on its mid course or final phase.
So you call call the ICBM a high-hypersonic space drone.. that launch Hypersonic missiles on its midcourse or final phase. A system like that will be a nightmare for any system defense.. because the initial interception data of the ICBM will be useless , since the warhead once eject it will follow a totally different flight path of the original ICBM.
No country in the world have an ICBM that can do that.. It is said US And China are working to develop one..
but Perhaps Russia finally got one and now improving it and testing
Such kind of weapon will be impossible to intercept with traditional air defenses NATO use.. like SM-3 ,THAAD or Patriot missiles.. and perhaps with S-400s and S-500s too, because of the lack of time to calculate the trajectory and the high maneuverability of the missiles. Since it will be equivalent of intercepting a missile that was launched from a satellite flying above any country and that will travel the distance in 60 seconds. To calculate the interception of 8 -12 MARV hypersonic missiles fired above above your airspace ,in just 60 seconds while they perform non predictable flight path will be a nightmare for not saying impossible for traditional modern defenses based of projectiles impact on another. You will need something more science fiction like defenses that do not exist yet for nation defense on a nation or city scale,like Giants Electric fields that destroy any object that cross it or EMP fields. etc.