What countries are currently under some form of embargo, sanctions, and restrictions?

The lists of countries under some form of U.S. embargo, sanctions, and restrictions are updated constantly. See here and here.

The current lists consist of:

• • • Afghanistan
    • Belarus
    • Burma (Myanmar)
    • Cambodia
    • Central African Republic
    • Congo
    • Côte d'Ivoire (Ivory Coast)
    • Cuba
    • Cyprus
    • Democratic People’s Republic of Korea (North Korea)
    • Democratic Republic of the Congo
    • Eritrea
    • Haiti
    • Iraq
    • Iran
    • Lebanon
    • Liberia
    • Libya
    • People’s Republic of China
    • Russian Federation
    • Somalia
    • Sri Lanka
    • Syria
    • Ukraine (Russian-controlled regions)
    • Venezuela
    • Yemen
    • Zimbabwe