Is China siding with North Korea against the United States?

Since Joe Biden became the American president, the United States has hinted it would consider holding a dialogue to resolve the issue of North Korea's nuclear and missile development. However, North Korea has made clear it’s not interested in the possibility of any contact with the US. The sister of North Korean leader Kim Jong-un, the photogenic Kim Yo-jong, has warned of confrontation. So what could China do to help matters? Is it interested in reducing the tension between North Korea and t...