If at war, whether PLA wants to come attack Singapore or come rescue Singapore, both cannot. Out of operational range. Only USA, Russia, UK and France got such range of operational capability.
The common saying, each PLA soldier pee once can flood Singapore, but how? Send pee by container shipping?
In the past, Japan was the only country in the far east capable of military outreach down south-east Asia all the way down Australia even New Zealand. Japan has given up that capability. China still hasn't achieved it.