How long will the UN look the other way as china and nk continue to openly defy sanctions? I really don't understand the point of 'imposing' something you are u

How long will the UN look the other way as china and nk continue to openly defy sanctions? I really don't understand the point of 'imposing' something you are unwilling or unable to enforce. It just makes them more boldface in their subtrifuge when we let it slide.