"To bombard someone with letters" is an expression actively used in the English language.

China hasn’t dropped bombs in, what, 60 years?

Almost correct. The last war-sized conflict China took part in was the 1979 Chinese-Vietnamese war [1]. That was 45 years ago. Battle-sized events between China and Vietnam have occurred up to 1991 [2], that would be up to 23 years ago. Skirmish-sized events with India are as recent as 2021. [3]. As for what occurs in Gaza, I agree. Bad stuff has been happening there. Going by the tonnage of things blowing up, Gaza is a gang shootout compared to Ukraine, though.