Why is the russian iskander missile ,very difficult to intercept ?what makes it difficult?

Perhaps it may due to that each missile has a 480 kilogram warhead consisting of 54 elements. The system can be used against small and large targets. The Iskander missile can easily overcome air defense systems. It's almost impossible to prevent a launch of an Iskander missile because of the system's mobility. Targets can be found not only by satellite and aircraft but also by a conventional intelligence center and by a soldier who directs artillery fire. Targets can also be found from photos, which will be put into a computer by means of a scanner. The self-direction device functions even in fog or darkness. Only the Iskander system can accomplish such tasks. The United States has tried to reconsider the missile technology control regime and here arises the question whether this may be an obstacle for the sale of the new missile abroad. Such missile systems as Iskander have a special place in the world weapons market. Even a small amount of such missiles drastically changes the balance of force in conflicts.