BERLIN -- The top diplomats of Britain, France, and Germany threatened to reimpose sanctions on Iran as an end-of-the-month deadline nears for the country to resume negotiations with the West over its nuclear program and cooperation with the United Nations nuclear watchdog.

If Iran does not re-engage in talks with the US by the end of the month, sanctions will be reinstated, the E3 says.

France, the U.K. and Germany are threatening a return to measures from a decade ago if Iran doesn't agree to a deal over its nuclear program.