But GarryB, lock on after launch is basically old technology, anything special about this tech w.r.t Morfei?
Lock on after launch is old technology with radar... ARH missiles like R-77 and R-37 can fly to target on autopilot and then when they get near the projected location of the target they can turn on their own radars, find the target and home in. If the target makes some serious manovuers after missile launch that will mean the target will not be visible to the missile by the time it starts scanning then the launch aircraft will send course corrections via datalink to ensure the target is visible to the missile when it starts looking.
For IIR missiles however lock on after launch is not so common... the AIM-9X does not have lock on after launch capability and needs to be lowered out of a weapons bay so it can look for its target before it can be launched, meaning a stealth aircraft opening its weapons bay and becoming non stealthy for long periods.
The Morfei will have an imaging IR seeker that can recognise 3D shapes and have an onboard database of 3D shapes so when it sees a 3D object from any angle it can identify it based on its shape and decide for itself whether to attack or keep looking.
It will likely have a two way datalink with the launch aircraft so the pilot can reassign the missile to a different more dangerous target if needed.... there is nothing Old about it....
The US and of late China have deployed several ocean-floor surveillance network. There is every possibility that Russian submarines will be detected by them. Better to stay within Russian waters and fire the anti satellite missile.
Detecting is not enough and there are no ocean floor sensor arrays near Antarctica... so a Yasen operating there can shoot down US satellite after US satellite and be relatively safe from retaliation.... by the time a US sub got there to stop it it simply could have moved on.
Well they can't put blanket over an entire ocean.