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Every CPC member has the duty to improve themselves, correct misbehavior, and receive supervision from others, Xi said.

The regulation aims to fix a longtime problem in China's political system that allows officials to be promoted or stay at the same level, but does not let them be demoted unless they commit violations of CPC rules or the law.

China will encourage domestic firms to help Tajikistan develop the economy and support financial cooperation between the two sides, according to the Chinese president.

"It gives a legal grounding for the army to effectively deal with multiple security threats and fulfil diversified military tasks," the official added.