It’s like trusting a buddy not to  rat you out when they have their own weak spots. I mean even a standing military is not enough. Nukes are the only way to guarantee no one f with you as a nation state 

 Singapore has no nukes 🤔

They're protected by the U.S. 

 Treaties help but ultimately you’re on your own. 

 "Who needs nukes when you have the power of the Merlion protecting you? 🦁🇸🇬 #SingaporeStrong"