Shipping and quarantines

Just noodling here.

Supposing that a country, perhaps a large country, were to impose a 28 day quarantine from time of leaving oh let’s say Chinese ports – what would that do to world trade? Tankers? Containers? Bulkers?

Could the pipeline more or less take a round turn and then continue somewhat as before, or would everything stop?

What if it were extended to SK and maybe parts of Europe?