Joh Sure, and who would enforce them?
That we do have sanctions that the US can enforce (sometimes) is related to the odd setup of the banking systems somewhat centralized in US east coast, with a couple outliers in the EU/CH like Swift. If these cut you off, you (as a country) are in most cases in a deep hole, especially if your economy is much smaller than the USA/EU.
Sanctions in other cases usually have the aspect that they hurt both sides, so if not all participants are fully committed, they will not participate openly, OR they will pretend only.
See also the People Republics' of China and North Korea and the UN sanctions against North Korea.
Somehow stuff that NK should not have is getting there, and NK has borders with SK (probably the best guarded border of the world), the Russian Federation and China. And China, which officially supports the sanctions, has been NK's sugar daddy for decades.
