* North Korea confirms successful nuclear test
* Russia says test violates international obligations (Adds quote, details)
MOSCOW, Feb 12 (Reuters) - Russia "decisively condemned" North Korea's nuclear test on Tuesday as a violation of Pyongyang's international obligations, a Foreign Ministry source told Interfax news agency.
"We condemn these actions by North Korea and view them together with the ballistic rocket launch carried out earlier (in December) as a violation of the corresponding U.N. Security Council resolution," the ministry source said.
Moscow used its vote on the U.N. Security Council last month to support a resolution that tightened sanctions against Pyongyang in response to its December rocket launch.
North Korea confirmed on Tuesday it had successfully conducted a third nuclear test, saying it used a miniaturised device that had a greater explosive force than previous tests. North Korea carried out nuclear tests in 2006 and 2009. (Reporting By Alissa de Carbonnel; Editing by Timothy Heritage)