For many decades, the problem of defence was not the Soviet Union's first priority. All its resources were devoted to strengthening its striking power and its offensive capabilities. But then China began to present a challenge. Of course, both Soviet and Chinese leaders knew that Siberia could never provide a solution to China's territorial problems. Siberia looks large on the map but even the great conqueror Jenghiz Khan, who had defeated Russia, China and Iran, by-passed Siberia, which is nothing more than a snowy desert. Both Soviet and Chinese politicians realise-as do their Western opposite numbers-that the solution of the Chinese territorial problem lies in the colonisation of Australia. Nevertheless, the Soviet Union takes steps to strengthen its frontiers, even though it is certain that the West will be the first victim of China, as it was the first victim of Hitler and of the Iranian students.

The Soviet Union knows from its own experience how peace-loving a socialist country becomes when its economy, and consequently its army, is weak. But it also knows what can be achieved by a country whose whole economy has been nationalised-a country in which everything of value belongs solely to the government and in which all resources can therefore be concentrated in order to achieve a single goal. Knowing this, the Soviet Communists are preparing for every possible contingency in good time.

In 1969 the problem of defending the 7,000 kilometre frontier with China became particularly acute. The calculation involved was a simple one: one division can hold a sector of 10 or, at the outside, of 15 kilometres of the frontier. How many divisions would be needed to defend 7,000 kilometres?

Since there was no question of using the old methods of conducting operations, new methods-new solutions-were found. We already know that one of the most important of these was the establishment of the airborne assault troops. A second was the introduction of a second arm of service-the Fortified Area Troops. This represented a return to the age-old idea of building fortresses.

Today's Soviet fortresses-the Fortified Areas-are either completely new or are established in areas in which there were old defences, built before the Second World War, which withstood repeated attacks by the Japanese army.

Modern Fortified Areas are, of course, so constructed as to survive a nuclear war. All fortifications have been strengthened against nuclear attack and contain automatic systems for the detection of poisonous gas and air filtration plants.

Today, the old reinforced concrete structures are hardly ever used for operational purposes. Instead, they serve as underground command posts, stores, barracks, assembly points, communications centres, or hospitals. All operational structures are being newly built. Here the Soviet Union finds itself in a very favourable situation, because it has retained tens of thousands of old tanks. These are now installed in reinforced concrete shelters so that only the turrets appear above the ground. The turrets themselves are strengthened with additional armour plating, often taken from obsolete warships. Sometimes the tops of turrets are covered with an additional shield made of old railway lines; the whole is then carefully camouflaged. Under the hull of the tank is a reinforced concrete magazine for several hundred shells and a shelter for personnel. The whole forms an excellent firing point, with a powerful (often 122mm) tank gun, two machine guns, an excellent optical system, reliable defence against a nuclear blast and an underground cable connecting it with the command post, With these resources, two or three soldiers can defend several kilometres of frontier. Since these tank turrets cover one another and since, in addition to them, the fortified areas contain thousands of gun turrets taken from obsolete warships, some of which contain quick-firing 6-barrelled 30mm guns, which are uniquely effective against infantry and aircraft, it would clearly be extremely difficult to break through such a line of defence. The Soviet Union has bitter memories of the way little Finland was able to halt the Soviet advance in this way in 1940.

Each fortified area is spaciously set out, to increase its ability to withstand the effects of nuclear weapons. Organisationally, each fortified area is manned by five or six battalions of troops, a tank battalion and an artillery regiment and is able to cover a frontier sector of 30 to 50 kilometres or more. Clearly, it is not possible to fortify the entire frontier in this way and fortified areas are therefore set up in the most threatened sectors, the intervening territory being covered by nuclear and chemical mines and by airborne assault sub-units, located in bases protected by the fortified areas. This whole arrangement has already enabled the Soviet Union to establish a defensive system covering enormous stretches of territory, without having to move a single one of the divisions earmarked for the liberation of Western Europe from capitalist oppression.

The Air Forces are the fourth most important of the Armed Services. There are two reasons for this low rating.

In the first place, the Commander-in-Chief of the Air Forces does not control all aircraft. Those of the Air Defence Forces-which are the fastest-are completely independent of the Air Forces. Those of the Navy, which include the most modern bombers, also have no link with the Air Forces. The airborne assault troops, as an integral part of the Land Forces, have nothing to do with the Air Forces either.

Secondly, unlike the Commanders-in-Chief of the Strategic Rocket Forces and the Air Defence Forces, the C-in-C of the Air Forces is not an operational commander but an administrator.

Subordinated to the C-in-C of the Air Forces in peacetime are:

Sixteen Air Armies

The Commander of the Long-Range Air Force

The Commander of Military Transport Aviation

Two military academies, officers' training schools, scientific research establishments, and test centres, administrative and supply echelons.

The total peacetime strength of the Air Forces is half a million men and 10,000 military aircraft and helicopters. However, the apparent strength of the C-in-C of the Air Forces is illusory. He is responsible for all questions concerning the functioning of the Air Forces, from the development of new aircraft to the allocation of rations for guard dogs, from the training of cosmonauts to the propagation of experience acquired in Vietnam, but he is in no way involved in questions concerning the operational use of the aircraft under his command. This means that he is not an operational Marshal, but an official and administrator, albeit one of very high rank.

In wartime all sixteen Air Armies become integral components of the Fronts. Each Front has an Air Army, which it uses as it considers necessary. Only the highest operational commanders-the C-in-C of a Strategic Direction or the Supreme Commander-may interfere in a Front's operational planning problems (including those of the Air Army belonging to it). The C-in-C of the Air Forces may only advise the Supreme Commander if his advice is sought; if not, his task is solely to ensure that the Air Armies receive all the supplies they need to carry out their operations.

Nor is the Long-Range Air Force operationally controlled by the C-in-C of the Air Forces. It is subordinated exclusively to the Supreme Commander, who can either make use of its entire strength or allocate part of it, temporarily, to the Commanders-in-Chief of Strategic Directions.

The same arrangement applies to Military Transport Aviation which is entirely under the control of the Supreme Commander.