Actually China condemned "Best Korea's" latest nuclear test, and well as Russia and China both via the UN security council. The test clearly is against the 6 party talks.
But China still keeps it's economic ties with North korea. Russia does to, but indirectly via China.
So if you want to complain about no one punishing North Korea, I would put the blame more on China then Russia... which both ARE going to be punishing North Korea for doing the latest test
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