To provide for the withholding of United States assistance to countries that aid or are engaged in nonmarket based trade with the Government of Cuba.

Directs the President to withhold assistance under the Foreign Assistance Act of 1961 to any foreign government providing economic, development, or security assistance for, or engaging in nonmarket based trade with, the Government of Cuba, unless the President certifies to the Congress that such assistance is vital to the U.S. national interest.