Bilateral, unratified agreement between the US and USSR prohibiting peaceful nuclear explosions which were not covered by the TTBT, with yields exceeding 150 kilotons and group explosions having an aggregate yield of over 1,500 kilotons, no one of which can be more than 150 kilotons. A companion treaty to the TTBT, the PNET provides for verification through national technical means, data exchanges and visits to sites of explosions in certain instances.
