 Another concern was that the nuclear test can be a threat to the security of Russia's far east regions which border North Korea.South Korean president Lee Myung-bak had a phone conversation with Russian president Dmitry Medvedev, where Medvedev told him that Russia would work with Seoul on a new U.N. Security Council resolution and to revive international talks on the North Korean nuclear issue.On 15 June 2009, China and Russia supported the UN sanctions on North Korea.