White House Press Secretary Karine Jean-Pierre said Thursday that the United States has “warned” Iran over its threats to Israel.

President Joe Biden said Wednesday that US support for Israel’s security was “ironclad”, despite his criticism of Prime Minister Benjamin Netanyahu’s conduct of the war in Gaza.

The United States has repeatedly made public appeals for China, seen as its top long-term global rival, to do more to address the Middle East crisis, including through pressure on Iran, which supports Hamas.

Beijing in turn has criticised the United States as biased toward Israel.

On Thursday, Netanyahu said Israel was preparing for conflict in sectors other than the Gaza Strip, while visiting the Tel Nof airbase to the south of Tel Aviv.

“We are in challenging times. We are in the midst of the war in Gaza, which is continuing at full force, even as we are continuing our relentless efforts to return our hostages,” Netanyahu told air force personnel at the base amid rising concerns of a revenge attack by Iran.

“However, we are also prepared for scenarios involving challenges in other sectors. We have determined a simple rule: Whoever harms us, we will harm them. We are prepared to meet all of the security needs of the State of Israel, both defensively and offensively,” he said in remarks translated from Hebrew.

During the visit to the base, which operates US-made F-15 combat planes, Netanyahu was briefed by the deputy base commander and the squadron commander on their operations during the war.

Also on Thursday, US General Michael Erik Kurilla, the officer commanding US forces in the Middle East, arrived in Israel.

Kurilla was in Israel to “discuss the current security threats in the region”, with the country’s IDF leadership, Pentagon spokesman Major General Pat Ryder said.

The US has restricted movements of diplomats in Israel over security fears, the embassy said.

Iran aims to contain fallout in Israel response, won’t be hasty: sources

“Out of an abundance of caution, US government employees and their family members are restricted from personal travel” outside the Tel Aviv, Jerusalem and Beersheeva areas “until further notice”, an embassy notice said.

“The security environment remains complex and can change quickly depending on the political situation and recent events,” the notice said.

The German airline Lufthansa, one of only two Western carriers flying to Tehran, extended a suspension of its flights to the Iranian capital and Russia warned against travel to the Middle East.

Lufthansa said it would probably not fly to Tehran before April 13. Austrian Airlines said it was still planning to fly on Thursday but was adjusting timings to avoid crew having to disembark for an overnight layover.

Iranian air space is also a key overflight route for Emirates’ and Qatar Airways’ flights to Europe and North America.

Emirates, Qatar Airways, Turkish Airlines, Aeroflot and Air Arabia, among the airlines that fly to Tehran, did not immediately respond to requests for comment.

German Foreign Minister Annalena Baerbock called on her Iranian counterpart Hossein Amirabdollahian to urge “maximum restraint” to avoid further escalation.

“Right now it’s very important for everyone to maintain restraint so as not to lead to a complete destabilisation of the situation in the region, which doesn’t exactly shine with stability and predictability,” Kremlin spokesman Dmitry Peskov told a news briefing.

British foreign minister David Cameron said on Thursday he had made clear to Amirabdollahian that Iran should not draw the Middle East into a wider conflict.

“I am deeply concerned about the potential for miscalculation leading to further violence,” Cameron said on X, formerly Twitter.

Agence France-Presse, Reuters and dpa