Today some changes were made to Metal Gear Solid V: The Phantom Pain, adjusting the effects of nuclear weapon ownership. On of the updates leads to players’ FOBs becoming less likely to be invaded as they own more nuclear weapons. You can check out the full update log below.
There’s still supposed to be a secret cutscene related to nuclear disarmament that players haven’t been able to unlock yet.
Source: Metal Gear Solid V: The Phantom Pain