TEHRAN, Iran: Iran’s foreign minister on Friday accused Israel of trying to undermine what he described as progress in Tehran’s nuclear talks with world powers.

The negotiations — which ended in Geneva on an upbeat note this week with Western and Iranian negotiators announcing a follow-up round early next month — are meant to reduce fears that Tehran is seeking a nuclear weapon.

Since moderate Iranian President Hassan Rowhani took office in August, senior officials from Rowhani on down have pledged to meet international concerns in exchange for an easing of crippling economic sanctions.

On Friday, Iran’s top representative in the talks, Foreign Minister Mohammed Javad Zarif, posted on his Facebook page that “there is a high possibility the talks would be disturbed through various efforts” on the part of Israel. Zarif said these efforts reflect Israel’s “frustration and warmongering.” Zarif was likely referring to Israeli appeals to the international community to maintain firm pressure on Tehran.

French Foreign Minister Laurent Fabius warned against unguarded optimism over the talks, saying “it’s too early to draw conclusions” and that any gestures toward Iran should be “prudent,” given past difficulties in getting Tehran to provide more information about its nuclear activities.