The Soviet Union says it will try to maintain its minuscule AIDS rate by screening foreigners for the deadly virus, even forcing mandatory tests of some visitors who cannot provide proper medical proof. Foreigners who want to stay in the country for three months or more will be subject to testing for the disease beginning next month, Foreign Ministry spokesman Gennady I. Gerasimov said. "Here, there cannot be any discrimination," Gerasimov said. "We conduct tests of our own people and besides, statistics show the Soviet Union is sharply lagging behind other countries, say the United States, in the number of ill people (with AIDS). And we just don't want to catch up."