Why are there different flavours of occupation?

The whole media and international attention are on Ukraine and the Russian invasion.

Most western countries are rushing to condemn the Russian occupation and their killing, taking land, etc. as acts of war, calling the Ukrainian resistance heroes, and giving them all the support they can.

On the other hand, Israel has been occupying Palestine for decades and is still taking land, killing people, and totally throwing peace treaties and international law in the garbage.

There have been many UN resolutions calling Israel an occupying force, especially in 1967 regarding the West Bank, and Amnesty International called Israel an apartheid state. On top of that, Israel is declaring they want a Jewish state, which means ethnic cleansing to the native Palestinians.

I know politicians can do whatever they want, but that is not politics, politicians have to come up with an explanation for this discrimination.

My question is, how can international law be effective and meaningful if it can only apply based on skin colour?

How should international organisations operate if it is only operated by powerful counties and does not apply to them?