Hello. I'll be grateful for some help.

1)Is it possible to use the prepositions "above", "upon", "on" in the phrase "to raise the
flag ...Palestine"?
2)Do you think the sentence is OK "He was killed in an Israeli air bombing"?
Thank you very much for help.

The most common phrases would be "raise the flag in Palestine" or "raise the flag above Palestine."

Your second sentence is correct.