We need to greatly strengthen a number of our military capabilities-nuclear capabilities too for sure. Russia and China need to know beyond any and all doubt that they won’t survive either.
Russia and China acquired nuclear arsenals in the wake of devastating war time losses. So did the British and French.
It introduced a stabilizing element in world politics. Nuclear weapons have made wars less likely.
We need to maintain an up to date nuclear deterrent to discourage potential future adversaries.
The reality is we still live in a very dangerous world.