A bit of a conundrum there, I admit. However, taking out the attack subs and the land based aircrafts is probably a necessary part of such an attack.
Any successful attack on the bastion would certainly give Russia an extremely strong incentive to launch their nukes before all the SSBNs had been taken out. It would be a strategic disaster to go for it. Still, tactically, a very exciting battle.
A very exciting battle indeed!