What is the ruling on one who wishes for the victory of the Zionists in Gaza over the Muslims, and what should I do concerning him?

Loving the triumph of the camp of disbelief over faith is impermissible, and it is a characteristic of hypocrites. It involves a type of loyalty to those who oppose Allah and His Messenger, and it may lead its perpetrator to disbelief and apostasy from Islam. Faith and love for the enemies of Allah cannot coexist in the heart of a believer. This person must be advised and reminded of Allah. If he repents, then praise be to Allah. If he persists, he should be boycotted if there is hope that the boycott will benefit him.