The Russian Defense Ministry confirmed Monday that the Democratic People's Republic of Korea (DPRK) conducted an underground nuclear test earlier in the day, Russian news agencies reported.
"Yes, indeed, our national facilities fixed the fact of a nuclear test in North Korea. Now we are analyzing data on the test. The power of the nuclear explosion is being specified," the Itar-Tass news agency reported citing a defense ministry source.
The source also said that the blast had a force of around 20 kilotons, according to Itar-Tass.
Meanwhile, Russian Ambassador to the UN Vitaly Churkin said that the United Nations Security Council would hold an emergency meeting on Monday to discuss the reported nuclear test staged by the DPRK.
The Russian Foreign Ministry also voiced "concern" over the nuclear test, and urged calm.
Earlier on Monday, the DPRK said it had successfully conducted an underground nuclear test.
South Korean officials said an "artificial earthquake" was detected near the northeastern town of Kilju, about 10 km away from the site where the DPRK staged its first nuclear test in October 2006.