In 1939 a regular direct flight connection had been established between Chongqing and Moscow. It was now possible to fly from one capital to the other in only five days. At the start of February 1941 Rudolf Hamburger took the flight to Moscow. He was now accommodated with others in a Dacha settlement a short distance outside Moscow. There are indications that the settlement was at Kuntsevo, where it is known that there was a training centre for potential intelligence operatives. During the early summer of 1941 he received extensive training, although according to his later reports the nature of it was uneven and the organisation of it often chaotic. Sometimes lecturers "came out from Moscow" But some of the most important lessons came from discussions with fellow students who, like Hamburger, had already had the benefit of a certain amount of experience in the field. By June 1941, with the German invasion imminent from the west, he was packing his bags again.