Do you comprehend that it is impossible to win in nuclear war? All existing treaties are just gentlemen's agreements and nothing more. There is no 100% protection against retaliation attack. USA builds its anti-ballistic missile defense. So lets now ask ourselves what ballistic missile is? It is just a safe way to store nuclear warheads at your own territory within your own security perimeter, so nobody else has access to it, except you. The same we can say about any other type of conventional nuclear warheads. The main concern is not about penetrating defense of your potential enemy, but guarantee long term safety of your own nuclear arsenal at your own territory. That is why Russia eliminated nuclear trains, because it is just not safe. It is extremely dangerous to drive trains with warheads across your own cities. So as you can imagine the other way is juts to place warheads into orbit and just wait for the time to drop them from the skies back. What is the problem with this? This is absolutely not safe for your own country to deploy such weapon. It can be just an accident at orbit or such satellite can be taken under control by an idiot or terrorist. It is not safe for your own country. Flying nuclear warheads by planes is dangerous. USA had several accidents in its history. Keeping them aboard of submarines is dangerous. We had accidents with nuclear submarines already. We do all precautions but we cannot avoid accidents with nuclear power stations: Chernobyl, Fukushima. It is safer to have small nuclear warheads and ballistic missiles stored in nuclear silos under guard of special forces. Further escalation of cold war style nuclear race will force sides to use less safe ways of storing existing weaponry, make more powerful warheads, multiply methods of delivery, enlarge military personal having access to nuclear warheads, be less safe and develop dangerous less human manually controlled types of machines. The potential ways to attack will be always cheaper than ways to defend. The race will elevate risks of accidents and loss of weapons to terrorists to extreme levels.
The current situation reminds me software engineering problems, when product managers are trying to redesign reliable working systems for the sake of having good job. When people having no idea about what to do in this life are trying to break what is working well.