The top United Nations court on Monday will begin hearing from 40 countries on what Israel must do to provide desperately needed humanitarian assistance to Palestinians in Gaza and the occupied West Bank.

The United Nations criticized Israel for its ban on aid in hearings at the International Court of Justice. Israel did not send a legal delegation and rejected the proceedings as biased.

The United Nations had asked the International Court of Justice for an advisory opinion on Israel’s obligations to facilitate aid under international law.