Do you support a rules-based system in the world?

https://sg.news.yahoo.com/china-demands-u-stops-unilateral-sanctions-over-north-150441118--sector.html

Many countries which support rules-based order or system in this world are keeping quiet when a big and mighty country like the USA is not following the rules-based order.

We must stop any country from imposing unilateral sanctions against another country without UN mandate.  What's the purpose of having an international entity like UN when a big and mighty country can just flout the international rules?

UN didn't stop the USA from invading Iraq with fabricated intelligence in the past.

UN is not stopping the USA from imposing excessive and illegal sanctions against NK now.

China is right to protest against the US for the unilateral sanctions.  We need to support a rules-based system and protest against any unilateral and illegal sanctions too.