SATAN 2 or any ICBMs in the American or Russian arsenal are vitually obsolete and only have a deterrence factor.
Except in North Korea's case that is. That's the only situation where Nuclear weapons are not obsolete as there is no Mutually Assured Destruction as only North Korea will be wiped off the face. The USA will have no problem in wiping that country off the face of the map and it will be destroyed inside 3 hours from the moment they launch anything towards South Korea or Japan. Russia and China will not come to North Korea's aid.
Russians should be very worried about these latest weapons because they are Submarine busters. These platforms are a submariners worst nightmare. They literally see them in their nightmare dreams as the Grimm Reaper. The capability is impressive and unmatched.
And they can keep flying for days and days.
The aircraft they are replacing are impressive too. The gear (mostly Israeli and American) on the back of those things has to be seen to be believed. One of the airframes has the highest classification and no one is allowed on it even to this day. Sad to see them being retired one by one. The gear on those things only got upgraded a few years ago and is 4th generation.