Russia Tests 'Satan II' Missile
Sarmat dubbed 'Satan II' is first post-Soviet 'super heavy' ICBM.
Putin claims Sarmat is world's most powerful missile system.
Sarmat warhead is four times more powerful than Western equivalents.
Test allows deployment of first Sarmat-armed regiment by 2026.
New START agreement expired in February, freeing Russia and US from arsenal restrictions.
2 days ago