The Soviet warning to Egypt about supposed Israeli troop concentrations on the Syrian border in May 1967 has long been considered a blunder that precipitated a war which the USSR neither desired nor expected. New evidence from Soviet and other Warsaw Pact documents, as well as memoirs of contemporary actors, contradicts this accepted theory. ...this warning was deliberate disinformation, part of a plan approved at the highest level of Soviet leadership to elicit Egyptian action that would provoke an Israeli strike. Soviet military intervention against the "aggressor" was intended to follow and was prepared well in advance.
- abstracted from THE COLD WAR'S LONGEST COVER-UP: HOW AND WHY THE USSR INSTIGATED THE 1967 WAR - Isabella Ginor - Middle East Review of International Affairs, Vol. 7, No. 3 (September 2003) [full pdf document here]