This was on the first day of hearings about Israel's obligations to facilitate aid deliveries.
Since March 2, Israel has completely cut off all supplies to the 2.3 million residents of the Gaza Strip, and food stockpiled during a ceasefire at the start of the year has all but run out.
At the opening of the hearings at the UN's top court, the UN's legal counsel said Israel had a clear obligation as an occupying force to allow and facilitate humanitarian aid for the people in Gaza.
"In the specific context of the current situation in the occupied Palestinian Territories, these obligations entail allowing all relevant UN entities to carry out activities for the benefit of the local population," Elinor Hammarskjold said.
Palestinian representative Ammar Hijazi said Israel was using humanitarian aid as "a weapon of war", while people in Gaza were facing starvation.
Israeli Foreign Minister Gideon Saar said Israel had submitted its position in writing to the hearings, which he described as a "circus".
--Reuters--