https://www.businessinsider.com/singapore-military-best-air-... Singapore has one of the best armies in the world, ostensibly to protect itself from Malaysia/Indonesia.

The same kind as Switzerland, one big enough to make it obviously not worthwhile to try and conquer. It takes 30 minutes by road from Johor to the heart of Singapore.

It's in an important strategic location. Ships going between China and Europe generally pass through the straight.

There was plently of conflict with Malaysia. Don't know about the current situation though.