The warning is an indication of Iran's concern that a potential deal with President Donald Trump 's administration could be knocked off course at a time Israel is concerned that a weak agreement could put Iran on the path to acquire nuclear weapons and is lobbying Washington intensively.

That the talks are even happening represents a historic moment, given the decades of enmity between the two countries.

Former foreign ministry official says the talks are a “litmus test” for diplomacy and “an opportunity for both sides to gauge each other’s positions beyond media narratives and rhetoric.”