(VIENNA) Major European powers want to admonish Iran at the U.N. nuclear watchdog over its ongoing refusal to give access to inspectors at sites suspected of activities that may have been part of a nuclear weapons programme, a draft resolution showed.

The International Atomic Energy Agency (IAEA) has issued two reports this year rebuking Iran for failing to answer questions about nuclear activities almost two decades ago before its 2015 nuclear deal at three sites and for denying it access to two of them.

A draft resolution, seen by Reuters and dated June 10, put forward by Britain, France and Germany calls on Iran to cooperate fully and promptly with the IAEA.

It asks Tehran to provide access to the locations specified and implement obligations under the Additional Protocol, referring to texts governing the IAEA's mission and activities.

"The Europeans couldn’t sit back and not do anything," a Western diplomat said.

U.S. intelligence agencies and the IAEA believe Iran had a secret, coordinated nuclear weapons programme that it halted in 2003. Israel's obtaining of what it calls an "archive" of past Iranian nuclear work has, however, given the IAEA extra information on Iran's previous activities.