Israel's prime minister says world powers can still insist on a better deal with Iran over its nuclear program as the negotiators' self-imposed deadline rapidly approaches.

Benjamin Netanyahu told a graduating class of pilots Thursday that "it is still not too late to insist on a good deal."

Iran and six world powers are racing to meet a June 30 deadline for a deal that would limit Tehran's nuclear activities in exchange for lifting sanctions.

Netanyahu has dubbed it a "bad deal," saying it would leave Iran with the ability to rapidly obtain nuclear weapons. Israel views a nuclear-armed Iran as its greatest potential threat.

Iran insists its nuclear program is for purely peaceful purposes.