Iran will seek “important changes” in a U.N.-drafted plan to ship enriched uranium out of the country for processing, state TV reported on Tuesday, raising alarm bells among Western leaders who are pushing the deal in hopes of easing concerns over Iran’s nuclear program.

The TV report said Iran would agree to the “general framework” of the plan but also request unspecified changes. That suggests Tehran will accept the idea of sending the uranium abroad — something it had previously appeared reluctant to do — but that there could be a tussle with the U.S. and Europe over how it will be sent and how much.