1. How do you know we aren't?
2. How much would zeroing out those two really move the needle?

1. There's been no public mention - at all - of those two countries. And they haven't done anything to reduce their imports in the last several years. So if we were actually putting pressure on them, it's been utterly ineffective - and it's completely avoided anything that would be visible to any observer.

2. Those two countries make up 100% of the EU's oil imports from Russia. If the complaint is that EU isn't "walking the walk," every other country in the EU has zeroed out their oil imports from Russia. These two are the only ones left. They comprise about 6% of Russia's total oil exports, globally. Taken together, they're the number three importer of Russian oil (behind only India and China). So if you're looking for "one way to stop Russian oil shipments," and pointing at the EU while doing it, these two countries are literally the entire needle.