Standing alongside Donald Trump in Florida a week ago, Benjamin Netanyahu was vague on the latest prospect of a ceasefire in the war in Gaza.“I hope we are going to have a deal. Time will tell,” the Israeli prime minister said, two days after his controversial address to a joint session of the US Congress.Throughout his three-day visit to the US, Netanyahu was careful to avoid making any commitment to the deal Biden unveiled on 31 May. While the US insisted publicly that the onus was on Hamas to accept the plan, the administration knew it also needed to pin down Netanyahu personally over his reluctance to commit to a permanent ceasefire.Yet, according to US reports, it now appears that at the very time Netanyahu was publicly speculating about a deal, a remote-controlled bomb had already been smuggled into a guesthouse in Tehran, awaiting its intended target: Ismail Haniyeh, the senior Hamas leader who was assassinated on Wednesday night.Haniyeh, reported the New York Times and CNN, was killed by an explosive device placed in the guesthouse, where he was known to stay while visiting Iran and was under the protection of the powerful Revolutionary Guards. Iran and Hamas have blamed Israel for the attack, which Israel has neither confirmed nor denied. It fits a pattern of previous Israeli targeted killings on Iranian soil.If the US secretary of state, Antony Blinken, is to be believed, Netanyahu never divulged any such plan to his American allies. The first Blinken knew of the assassination was when he was told in Singapore, after the event. Later that day he insisted he had been left blind-sided, almost as badly as Iranian intelligence.In Netanyahu’s defence, Israel has not confirmed the US media accounts, nor has it ever made any secret of its intention to kill the senior Hamas leadership as a reprisal for the 7 October attacks. And even as he spoke to Congress, the prime minister could not have known that the reported plan would work so well, or have such a devastating impact.However, the potential consequences of such an assassination were clear to all. It took the frustrated Qatari prime minister, Sheikh Mohammed bin Abdulrahman al-Thani, to accuse Netanyahu of sabotage. “How can mediation succeed when one party assassinates the negotiator on the other side?” he asked.In Washington, the national security council spokesperson John Kirby put on a brave face, claiming the ceasefire process had not been “completely torpedoed”, and insisting: “We still believe the deal on the table is worth pursuing”.The assassination underlines how the US is often left looking like the junior partner in the relationship with Israel, observers say. Matt Duss, a former foreign policy adviser to Bernie Sanders, said: “It is another case of Netanyahu putting up two fingers to Biden. There has been month after month after month of these just repeated affronts and humiliations from Netanyahu, culminating in this ridiculous moment last week, where he came and spoke in front of the Congress yet again, to undermine Biden’s ceasefire proposal. Yet Biden, who sets such store by personal relations, refuses to change course.”Duss has said that by refusing to control the supply of US weapons as a means of leverage with Israel, Biden has left Netanyahu free to pursue the war. Biden was left to ring Netanyahu two days after the assassination, and to promise to defend Israel from any threats from Iran and its proxy groups. If there was any private admonition or disapproval, the public read-out of the call concealed it.Biden later expressed his frustration, telling reporters: “We have the basis for a ceasefire. They should move on it now.” Asked if Haniyeh’s death had ruined the prospect of a deal, the president said: “It has not helped.”The killing is a further indicator of how the Biden administration cannot capitalise on a security relationship with a politician whose methods and objectives it does not share, and who it suspects wants its political rival to triumph in November’s US election. Moreover, both Trump and Netanyahu share a common goal – having political power to stave off criminal proceedings against themselves.At issue, too, is the effectiveness of Israel’s long-term military strategy for dismantling Hamas, including the use of assassinations on foreign soil.Haniyeh is the third prominent member of Iran-backed military groups to be killed in recent weeks, after the killing last month of the Hamas military leader Mohammed Deif in Gaza and the strike on the Hezbollah commander Fuad Shukr in Beirut, in turn a response to the killing of 12 children and teenagers in the Druze village of Majdal Shams.In total, according to ACLED, a US-based NGO, Israel has mounted 34 attacks that have led to the death of at least 39 commanders and senior members of Hamas, Hezbollah and the Revolutionary Guards in Lebanon, Syria, and Iran in the past 10 months.Hugh Lovatt, a Middle East specialist at the European Council on Foreign Relations, describes the killings as a tactical victory, but a strategic defeat. “Haniyeh was a proponent of Palestinian reconciliation, and of a ceasefire. So taking him out of the equation has an impact on the internal power dynamics within the group by strengthening the hardliners, at least in the current term,” he said.Netanyahu, Lovatt added, was undermining Haniyeh “by going back on agreed positions and by being very vocal in saying as soon as the hostages were released we recommence fighting Hamas”.Nicholas Hopton, a former UK ambassador to Tehran, said he feared the assassination was part of a deliberate attempt to sabotage the hopes of the new Iranian president, Masoud Pezeshkian, to rebuild relations with the west.“You can overstate what a reformer means in Iran – he went to the parliament wearing an IRGC uniform – but he was going to give relations with the west a go,” Hopton said. “I think the supreme leader is deeply sceptical it will lead anywhere but thought it was worth an attempt. Pezeshkian may now be stymied right away, and I think that’s what the Israeli assassination of Haniyeh in Tehran was partly designed to do.”Inside Iran, Mohammad Salari, the secretary general of the Islamic Solidarity party, said the killing should be seen as more than the removal of one political figure. The hidden purpose was to overshadow the new government’s policy of engagement and de-escalation, he said.“Netanyahu will use all his efforts to lay stones in the path of realising Iran’s balanced foreign policy, improving relations with European countries, and managing tension with the United States, just like during the nuclear negotiations.”So when the Hezbollah leader, Hassan Nasrallah,threatened an open battle on all fronts, he probably meant, according to Lovatt, a multi-pronged response designed not to trigger a regional war, but to go further than the retaliation mounted by Iran alone in April. It was notable that Nasrallah added a plea to the White House: “If anybody in the world genuinely wants to prevent a more serious regional war, they must pressure Israel to stop its aggression on Gaza.”At the moment that plea lies unanswered. More