Iran unveiled two new air defence systems on Saturday, state media reported, with tensions high in the Middle East amid the war in Gaza.

"The Arman anti-ballistic missile system and the Azarakhsh low-altitude air defence system, built by the ministry of defence, were unveiled this morning," the official IRNA news agency said.

The unveiling of the new weapons comes at a time of heightened regional tensions with the war between Israel and Tehran-backed Hamas raging into a fifth month.

Israel is waging a concerted campaign aimed at destroying UNRWA, the head of the UN agency for Palestinian refugees said in an interview published Saturday.

Philippe Lazzarini said calls for his resignation were part of the Israeli government's push.

"Right now we are dealing with an expanded, concerted campaign by Israel aimed at destroying UNRWA," he told the Swiss newspaper group Tamedia.

A climate of fear pervades a hospital in the occupied West Bank city of Jenin, where patients and doctors are reeling from last month's deadly raid by Israeli agents disguised as medics.

At the rehabilitation ward at Jenin's Ibn Sina hospital, two patients recalled hearing the screams of a nurse as Israeli forces reached the third floor.

"I opened the door and saw a man. I didn't know they were special forces," said a patient, a grey hoodie pulled up over his head to conceal his face. "The man was choking the nurse with his hand and hit her with the butt of his gun."

Yemen's Iran-backed Huthi rebels on Saturday claimed an attack a day earlier on an oil tanker in the Red Sea, the latest in a series of strikes which have led to retaliation by Britain and the United States.

The Huthis said the vessel was British, although the US military later said it was Danish.

Huthi naval forces "carried out an operation targeting the British oil tanker Pollux in the Red Sea" with missiles, rebel spokesman Yahya Saree said in a statement.

He did not say how the rebels had determined a "British" connection to the ship.

Abdullah Ocalan, the jailed founder of Kurdish militant group the PKK, is hailed by many Kurds as an icon, but within wider Turkish society many see him as a terrorist who deserves to die.

On Saturday, Ocalan, who has been held in solitary confinement in Turkey since 1999, received his first political visit in nearly a decade amid signs of a tentative thaw in relations with the Turkish government.

A lack of long-range missiles and artillery shells is limiting Ukraine's fightback against Russia, President Volodymyr Zelensky told a defence conference on Saturday, making a fresh appeal for more weapons.

Later in the day, delegates at the conference also discussed the situation in Gaza, with some holding out slim hopes of a lasting solution to end the Israel-Hamas war.

Mediator Qatar acknowledged on Saturday that prospects for a new pause in Israel's war with Hamas were "not really promising" as Israel rejected appeals to hold off on a threatened assault on the Gaza city of Rafah.

Prime Minister Benjamin Netanyahu said that foreign countries calling on Israel to spare the city, where 1.4 million Palestinians have sought refuge, were effectively telling the country to "lose the war".

The UN's top court Friday rejected South Africa's request to put more legal pressure on Israel to halt a threatened offensive against the Gaza city of Rafah, saying it was "bound to comply with existing measures".

Pretoria has already filed a complaint against Israel in the International Court of Justice (ICJ) in The Hague, alleging that its assault on Gaza amounts to a breach of the Genocide Convention.

A missile fired from Yemen damaged a Panama-flagged tanker off the coast in the Red Sea on Friday, security agencies and a US official said.

It came as the US formally redesignated Yemen's Huthi rebels as "terrorists" over their attacks on shipping in the Red Sea, a campaign the Huthis say is in solidarity with Palestinians in Gaza amid the Israel-Hamas war.

A US State Department spokesperson said a missile fired from Yemen "struck the port side of the India-bound, Panamanian-flagged MT Pollux, which was carrying crude oil."

Hezbollah chief Hassan Nasrallah vowed Friday that Israel will pay "with blood" for civilians it killed in Lebanon this week, warning the group has missiles that can reach anywhere in Israel.

"The enemy will pay with blood" for every woman and child killed in Lebanon by cross-border fire, Nasrallah said in a televised address.

He warned that his Iran-backed movement has "precision-guided missiles that can reach... Eilat", on Israel's Red Sea coast, well beyond the northern towns it usually targets in retaliatory strikes.