Israeli Prime Minister Naftali Bennett on Sunday urged world powers to take a hard line against Iran in negotiations to curb the country’s nuclear programme, as his top defencee and intelligence officials headed to Washington amid the flailing talks.

Israel has been watching with concern as world powers sit down with Iran to jump-start talks on the tattered nuclear deal. Iran last week struck its own hard line as talks resumed in Vienna, suggesting everything discussed in previous rounds of diplomacy could be renegotiated. Iran also isn’t slowing down the advances in its atomic programme, further raising the stakes in the talks, which are crucial to cooling years of tensions boiling in the wider mid-east.