Nuclear talks between Iran and the six world powers have only given the Islamic republic more time to pursue its quest for a nuclear weapon, a senior Israeli official told AFP on Saturday.

The latest round of talks, in the Kazakh capital Almaty, were aimed at breaking the decades-old deadlock over Iran's atomic program.

"We understand that the only thing that was achieved in these talks was to give Iran more time to move ahead in its quest for a nuclear weapon," the Israeli official said.

The official said that after the talks, US Under Secretary of State for Political Affairs Wendy Sherman arrived in Israel and briefed Israeli National Security Adviser Yaakov Amidror over the weekend.

The US State Department had on Wednesday called the talks "useful," while Israeli Prime Minister Binyamin Netanyahu warned that if Iran does not heed calls to halt its nuclear program, it should face "a military sanction."