Israel is provoking famine in Gaza and using starvation as a weapon of war, the EU's foreign policy Chief Josep Borrell said on Monday.

"In Gaza, we are no longer on the brink of famine, we are in a state of famine, affecting thousands of people," Borrell said at the opening of a conference on humanitarian aid for Gaza in Brussels.

"This is unacceptable. Starvation is used as a weapon of war. Israel is provoking famine."

Israeli Prime Minister Benjamin Netanyahu said on Sunday he would keep on with the military campaign against Hamas in Gaza, where aid agencies say famine is looming, while ceasefire talks were set to resume.

Netanyahu told a cabinet meeting that Israel would push into Rafah, the last relatively safe place in the tiny, crowded Gaza enclave after more than five months of war, despite international pressure for Israel to avoid civilian casualties.