Hamas are not representative of the Palestinian state at the UN, where they have been accepted as an observer state of the United Nations General Assembly in November 2012.
Following the Oslo I Accord in 1993, the Palestinian Authority and Israel conditionally recognized each other's right to govern specific areas of the country.
Palestinian President Mahmoud Abbas said the US’s veto made it “complicit” in war crimes in Gaza. “The president has described the American position as aggressive and immoral, a flagrant violation of all humanitarian principles and values, and holds the United States responsible for the bloodshed of Palestinian children, women and elderly people in the Gaza Strip,” a statement from his office said.
World Opinion@Al Jazeera
Fun Fact #7 - As of 2 June 2023, 139 of the 193 United Nations (UN) member states have recognized the State of Palestine (Israel is recognized by 165).