Destroying Strategic Bases

Is there a way to get rid of your own strategic bases? I don't have any strategic weapons and it says my defences are too weak

No. The game gods have determined that your country must use Strategic Weapons Maintenance in order to subsidize the strategic weapons market.

But I want to cut my defence budget! So there's no way around it?

You can at the minimum have 1 of each type of base/airbase remaining. You cannot reduce your budget any less