Russian President Vladimir Putin said Monday that Iran has not excluded the possibility of conducting its uranium enrichment in Russia - a proposal that could be a way out of escalating tensions over Iran's nuclear program. Putin, speaking after a meeting with German chancellor Angela Merkel, said "one of the main problems is the enrichment of uranium. We proposed to our Iranian partners to set up a joint enrichment venture on Russian territory. We have heard various opinions from our Iranian partners on that issue. One of them has come from the Foreign Ministry - our partners told us they did not exclude the implementation of our proposal." "In any case, it's necessary to work carefully and avoid any erroneous moves," Putin said. Iran last week removed UN seals on its uranium enrichment facilities, defying international pressure not to resume enrichment, which can be used to develop fuel for nuclear reactors or material for atomic weapons.