Soviet foreign policy in Asia had long been dominated by the need to contain China. Since 1969 strong forces had been built up along the 4,000-mile border, amounting to almost a quarter of the Red Army, around fifty divisions in all. They were there simply to defend the border, to prevent China from altering it by force (it was disputed in many places) and to see that if fighting did break out the Soviet Union would get the better of it. There was no intention of using them to mount an invasion of China: that would be to fight the way Peking wanted it. The Chinese would welcome the chance to draw an attacker deep into their often brutally inhospitable country and then wear him down with an inexhaustible supply of hardy defenders. That was not Moscow's idea at all.
There was the United States to worry about as well. The US Seventh Fleet had recovered considerably from a low point after the Vietnam war and had now built up its strength once more. It had the advantage of being able to operate from forward bases in the western Pacific, giving it a flexibility that the Soviet Pacific Fleet with its own limited bases and virtually no allies did not have. The new US
It was very much the fault of the Soviet Union that Japan had in the late 1970s and early 1980s begun to change its security policy. As Soviet military strength in the Far East increased it was impossible in Japan to ignore its presence. Soviet garrisons were built up in the Northern Islands which Japan claimed as her own; Soviet aircraft infringed Japanese airspace; Soviet naval activity was prominent. Overt Soviet support for Vietnam and markedly insensitive Soviet diplomacy towards Tokyo in the wake of the Sino-Japanese Peace Treaty of August 1978, an obvious sign of displeasure, created in Japan a distinct awareness that the world around it was no longer benign. Public consent for an increase in defence spending, so grudgingly given in the past, slowly emerged. A programme of modernization was started, notably in the maritime and air self-defence forces, which quickly picked up speed, aided by the ability of Japanese industry to deliver the goods. A sense of nationalism, of being under threat, began to take over. As always in Japan, when a consensus had been formed, change was swift. The maritime self-defence force acquired an anti-ship capacity and took over sea control of the Sea of Japan and out into the open sea lanes, freeing the US Navy for offensive tasks. The air self-defence force, re-equipped with F-15
By late 1984, when acute East-West tensions were inexorably leading to world war, the strategic setting in Asia was not at all in the Soviet favour, despite her own force expansion. While the Soviet leaders could feel with some reason that events in the Middle East and Africa were moving their way and could feel confident about the outcome of a war in Europe, about Asia they had real doubts. Soviet strategy was therefore plain: try to keep the region quiet. China and Japan must be persuaded that it was in their interest to keep out of any war between the Soviet Union and the United States. If that did not prove to be possible, China would have to be contained until the war in Europe was won. It could then be dealt with, and harshly. But at all costs there must be no war on two fronts.