An amendment to prohibit the use of FY 1988 funds for conducting nuclear explosions with a yield greater than one kiloton, provided that the Soviets halt testing and agree to the installation of in-country monitoring equipment on a reciprocal basis. The ban would go into effect 90 days after enactment of this Act, and would be lifted only if the President certifies that the Soviets have failed to permit in-country monitoring, conduct tests with a yield greater than one kiloton, or conduct tests outside a designated test area.