The U.S. aim is to keep them from trading with China and Russia
The Iron Curtain of the 1940s and ‘50s was ostensibly designed to isolate Russia from Western Europe – to keep out Communist ideology and military penetration. Today’s sanctions regime is aimed inward, to prevent America’s NATO and other Western allies from opening up more trade and investment with Russia and China. The aim is not so much to isolate Russia and China as to hold these allies firmly within America’s own economic orbit. Allies are to forego the benefits of importing Russian gas and Chinese products, buying much higher-priced U.S. LNG and other exports, capped by more U.S. arms.