In a statement, it said it was "inexplicable" that a proposal including the security, protection and prosperity of Palestinians was vetoed in the UN Security Council, which is "the primary authorized and responsible mechanism for worldwide peace, stability and security".
UNITED NATIONS: The United States vetoed Friday an Arab-backed UN draft resolution calling for measures to protect the Palestinians but failed to win backing for its own text condemning Hamas for the violence in Gaza.
The US was the only council member to vote against the proposal. The United States was the only country that voted against the text.
A draft resolution requires nine votes to be adopted in the 15-member council and no veto from the five permanent members - Britain, China, France, Russia and the United States.
United Nations envoy Nikki Haley said the US will veto an anti-Israel resolution over the ongoing Gaza tensions.
There is not one single mention of Hamas in the Kuwaiti text, when Hamas is chiefly responsible for the recent violence in Gaza, Haley said in a statement.
After consultations with Europeans, the draft was amended and in its final version urged "the consideration of measures to guarantee the safety and protection of the Palestinian civilian population in the Occupied Palestinian Territory, including in the Gaza Strip".
In December, Haley vetoed a measure that rejected President Donald Trump's decision to move the United States embassy to Jerusalem after all 14 other council members supported it. It calls for urgent steps "to ensure an immediate, durable and fully respected ceasefire" and asks UN Secretary-General Antonio Guterres for a written report within 60 days detailing recommendations about "an global protection mechanism".
It was the second time that Haley has blocked a United Nations measure on the Israeli-Palestinian conflict.
More than 120 Palestinians have been killed by Israeli forces along the fence that divides Israel from Gaza since the protests erupted in March. Israel said its troops were defending its border and accused Hamas of trying to attack under the cover of the protest.
An exchange of fire on Tuesday and into the early hours of Wednesday began with a barrage of rocket and mortars into Israel from Gaza, prompting Israel to respond with strikes on 65 sites in the Gaza Strip. Tuesday's torrent of rockets and mortars prompted the U.S. to call for Wednesday's meeting, where UN Mideast envoy Nikolay Mladenov said the latest escalation in Gaza was a warning of "how close to the brink of war we are every day". It was the largest flare-up for violence between the sides since a 2014 war. The army also said that a military vehicle came under fire, and a grenade planted on the fence exploded.
Only the United States voted in favour of the second draft resolution, while there were three negative votes and 11 abstentions.