I read somewhere before that it’s common to use neighbour airspace to land. The fact that they are creating issues out of no issues to make this difficult for Singapore shows that they are petty and bad neighbour. And they only do that to Spore and not Indonesia Thailand shows that they are a big bully.
If there is good relations, no issue. But when SINKapore imposes ILS flight path without consultation, then that is a problem. Mudland just showing SINKapore that it can play the game. If we give it, then we must be able to take it too.