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As a permanent member of the Security Council and a regional neighbor, China should strongly urge North Korea to stop threatening the international community. The underlying reason why China agreed to adopting a U.N. resolution is its strained relationship with the United States over Beijing's territorial claims in the South China Sea and to the Senkaku Islands. We believe China judged it would be an additional burden on the country if it also clashed with the United States over North Korea. Efforts to boost sanctions against North Korea will be meaningless if they fail to produce tangible results. China, which accounts for about 70 percent of North Korea's trade, has a heavy responsibility to strictly comply with and strengthen the sanctions, such as an embargo on commodities...