Three European powers said on Tuesday "we are rapidly reaching the end of the road" to save the 2015 Iran nuclear deal as Tehran accused Western powers of engaging in a "blame game."

The comments suggest indirect U.S.-Iran talks on preserving the pact under which Iran limited its nuclear program in return for relief from economic sanctions may be approaching collapse, with all sides seeking to avoid being held responsible.

"Iran's continued nuclear escalation means that we are rapidly reaching the end of the road," France's ambassador to the United Nations, Nicolas de Riviere, said at the world body, reading a joint statement from Britain, France and Germany.