North Korea sanctions: China opposes additional UN Security Council sanctions... Why before the Olympics?

Attempts by the UN Security Council to impose additional sanctions on North Korea were thwarted by opposition from China and Russia. It is reported that China delayed the adoption of the US proposal ahead of a closed-door meeting of the Security Council on the 20th (local time). Earlier, the United States requested the Security Council to impose additional sanctions at the Security Council level on five North Koreans belonging to the North Korean Academy of Defense Science. It is interpreted as a response to North Korea's successive ballistic missile launches. Additional sanctions are possible through unanimous consent of the five…