In the world we live in today, what the government does in one place can affect things on the other end of the world. If there is a problem with a shipping route, or if two countries start making it harder to trade with each other, or if there is trouble in a certain area, it can change a lot of things. It can affect the manufacturing schedule and product availability in stores.
These things show that what happens with politics and countries is having an impact on the global supply chain.