The whole premise of this thread is ludicrous because for it to make sense, the Soviets would have to have known at the time of the Mexico City trip that months later, Oswald would end up have a job at a building overlooking the motorcade route. The motorcade route was unknown at the time. Nobody even knew there would be a motorcade, much less where it would go.
This also refutes the suggestion that the Cubans or the Soviets told Oswald at the time to take out JFK. What reason would they have had to single out Oswald to assassinate JFK?