Embargo

An embargo is a government's order banning trade with a specific country entirely, no imports, no exports, sometimes no travel either, rather than the more targeted restrictions a sanction usually involves. It's one of the more extreme economic tools available short of military conflict, and it tends to be reserved for the most serious geopolitical standoffs. Embargoes can badly damage the isolated country's economy, but they also close off a market entirely for domestic businesses that used to trade there, which is part of why they're rare and usually controversial even within the country imposing them.