>>513463179
How about be an adult and look it up yourself. Who even thinks like this? Do you imagine nukes are like giant piles of tnt tied to a rocket?
I honestly can't even take your question seriously so i'm sorry for not wanting to explain how to maintain and effectively use a nuclear fucking bomb to you.
To put it simply, they have a shelf life and are notoriously difficult to maintain and effectively use on the battlefield, specially if you're a backwards rump state like ukraine.