in response to what you are saying, we can't exclude the Commonwealth from "the West", but maybe it's about time to make a term that does essentially do that. The complement to the union in graph theory. The West except the Commonwealth.
For one thing, it is a small and remote island.
For another thing, it supplies most of the world's sterile bovine serums because the country has never had a case of mad cow disease. Laugh all you want, but that's a lucrative market and they are very good at border controls.
But yes, being remote, and being islands surrounded by lots of ocean definitely helps.
Also, both of our largest islands are far larger than Czechia. The South Island/Te Waipounamu is over twice the size of Czechia.
Unless you're suggesting the US station ten million soldiers on the border and shoot anyone who tries to enter (hint: this is not politically feasible) closing the US is hopeless.
...so how much Covid was brought to Czechia by illegal entry?