Foreign Policy

Czechslovakia 1968

Peking Review argues against this better than I can. From Chinese Government and People Strongly Condemn Soviet Revisionist Clique's Armed Occupation of Czechoslovakia:

The Soviet revisionist leading clique has all along pursued the counter-revolutionary policy of U.S.-Soviet collaboration for world domination. Since the Glassboro talks, not to mention anything earlier, U.S. imperialism and Soviet revisionism have struck a series of dirty deals on such important questions as Vietnam, the Middle East and the prevention of nuclear proliferation. The present Czechoslovakia incident is no exception. It is the result of the sharpening contradictions in the scramble for and division of spheres of influence by U.S. imperialism and Soviet revisionism in Eastern Europe; it is, moreover, the result of the U.S.-Soviet collusion in a vain attempt to redivide the world. The aggression by Soviet revisionism was carried out with the tacit understanding of U.S. imperialism. Since U.S. imperialism has acquiesced in the invasion and occupation of Czechoslovakia by Soviet revisionism, how is it possible for Soviet revisionism to oppose the forcible occupation of south Vietnam by U.S. imperialism In fact, Soviet revisionism has long become the No. 1 accomplice of U.S. imperialism in its aggression against Vietnam and the rest of the world. That a big nation should have so willfully trampled a small nation underfoot serves as a most profound lesson for those harboring illusions about U.S. imperialism and Soviet revisionism.

Middle East

Similarily

It is common knowledge that Soviet revisionism sends Jews to Israel every year. Some 100,000 Soviet Jews have streamed into Israel in the four years since 1970. Public opinion in the Arab countries scathingly denounced this despicable act detrimental to the Arab people’s struggle. The Egyptian paper Al-Ahrum pointed out: “The Soviet Union’s decision could be interpreted as meaning permission for Soviet Jews to fight the Arabs.” The Kuwaiti paper Ar Rai al-Amm said: “It is a conspiracy jointly perpetrated by U.S. imperialism and Russia against the Arab people.” As to Soviet revisionism’s other ugly performances in the Middle East, they became quite notorious much earlier. It amassed ill-gotten wealth by selling arms in the Middle East and pressing buyers for repayment of debts on earlier purchases, which greatly angered the Arabs. In speeches made during the year, Egyptian President Anwar Sadat time and again accused the Soviet Union of making difficulties on the question of arms supplies and dunning Egypt with demands for repayment of debts in an effort to control Egypt through “aid.” The Egyptian President, however, made it clear that “we are not prepared to cede any part of our national will!”

From Ugly Features of Soviet Social-Imperialism:

For years the Egyptian people have waged an arduous struggle against Israeli aggression, a struggle which took the lives of many of their fine sons and daughters. In no circumstances should the fighting Egyptian people be pressed for repayment of debts. It stands to reason that all the debts to Soviet revisionism incurred for defence purposes should be written off.

One of the Soviet revisionists' sharp practices is to ban arms supplies in times of need. On the eve of the 1973 October War when the Egyptian people were making preparations against aggression, the Soviet revisionists time and again held up delivery of the arms promised. Towards the end of the war when Israel, equipped with numerous U.S. planes and tanks of the latest design, penetrated into the west bank of the Suez Canal, the Soviet revisionists did not hesitate to turn down Egypt's repeated requests for recoupment at the critical moment of its struggle, compelling Egypt to accept a ceasefire. Throughout the 14 months following the October War, Egypt got no arms replenishment worth mentioning from the Soviet Union. Such is the truth about the much vaunted "powerful" Soviet support for Egypt during its most difficult days.

Vietnam 1979

In defense of the 1979 war look at Peking Review again:

The Chinese frontier forces counterattacked when the situation became intolerable and there was no alternative. To make China a prosperous and strong socialist state and attain the magnificent target of four modernization's by the end of this century, the Chinese people urgently need an international situation of peace and stability. However, the trees may prefer calm but the wind will not subside. Instigated by Soviet social-imperialism and with its support, the Vietnamese authorities escalated their armed encroachments upon China to intolerable dimensions, compelling us to take action much against our will.

The Vietnamese authorities are nationalist expansionists. To achieve their ambition for setting up an "Indochina federation" and dominate Southeast Asia, they have acted perfidiously and have unscrupulously committed aggression and expansion. While accepting massive aid from the Chinese people who were able to provide it only by dint of practicing strict economy and at the cost of sweat and blood, the Vietnamese authorities slandered socialist New China which consistently upholds proletarian internationalism, and fanned up national hatred by making distorted interpretations of historical events and even seized Chinese territory by force of arms. Their expansionist ambition has inflated in the past two years. They openly trampled underfoot all norms of international relations, flagrantly invaded Kampuchea and frantically intensified their anti-China campaign

Instead of striving for economic restoration and improving the living conditions of the Vietnamese people after the war of resistance against the United States, the Vietnamese authorities have made use of the political capital and military equipment gained from the war and depended on Moscow's backing to hastily push ahead their plan for establishing an "Indochinese federation" in an attempt to dominate Southeast Asia. They have dispatched 50,000 troops to Laos to control the country. They have used 150,000 troops to launch a large-scale war of aggression against Kampuchea. At the same time, they have dispatched armed personnel to repeatedly intrude into Chinese border areas and provoke incidents of bloodshed, and made frequent war cries against China, making China the "main enemy."