4 Senators Cancel Moscow Trip

WASHINGTON — Four senators canceled a trip to Moscow today because the Kremlin denied a visa for an aide who had written a critical report on the Soviet occupation of Afghanistan.

Sens. William S. Cohen (R-Me.), Joseph R. Biden Jr. (D-Del.), Carl Levin (D-Mich.) and Warren B. Rudman (R-N.H.) were to have left today for talks in Moscow with members of the Soviet Academy of Sciences. John Ritch, an aide to Biden, was to accompany the delegation. Cohen said the Soviet embassy on Friday unexpectedly denied Ritch a visa, stating its objections to his 1984 committee report on conditions in Afghanistan.