Moneyprinting question

Hey,

I get all the inflation issues. I get devaluing your own currency when printing more of it. But what I don't understand is why a country cannot print a lot of money (stealth) to immediately buy foreign currencies or especially Bitcoin with (and not let it enter domestic circulation, if that makes sense). Does it ruin the BTC pair with their own currency or what's the main problem? If that's the case, they could ruin their own pair with say, their neighbors currency, then proceed with buying USD with their neighbor's currency and wreck that too in the process. I don't really grasp this. I would love for someone truly knowledgeable to explain more.