Kuwait is quite similar in its structure to the Greek city state, usually consisting of an urban core and its surroundings. Also Monaco and San Marino where oc

Kuwait is quite similar in its structure to the Greek city state, usually consisting of an urban core and its surroundings. Also Monaco and San Marino where occupied for some time during WW2. Not sure if they count as modern city states in your view ;-) City states just do not have enough strategic depth to be defensible in modern warfare. That being said, Singapore is a good example for a modern city state that maintains quite a strong deterrence against being conquered.