After Stalin died in 1953, Khrushchev slowly but surely centralized all power in his hands. He did this by inventing "evil crimes committed by Stalin" and purging anyone who disagreed under the accusation of "having collaborated with stalinist crimes". For example, Lavrenty Beria suffered this fate. Principled party members like Molotov and Kaganovich tried to depose Khrushchev in a vote but he staged a military coup and had them arrested too. Once all opposition was gone, he continued "destalinization" by proposing his "peaceful coexistence theory", meaning that capitalist west and socialist east can coexist peacefully forever, so no reason to worry about WW3. This is ludicrous, socialism and capitalism simply cannot coexist, in the end one always wins over the other. He also said that the Communist Party should represent "the entire soviet people", instead of just the workers and peasants, basically including the bourgeoisie into the party. This contradicts every basic marxist tenet of class struggle. No, you cannot unite bourgeoisie and proletariat under 1 party, its impossible. The workers and peasants only must rule under socialism.
Mao saw all of this, and initially tolerated it. But after the military coup in 1957 and his "peaceful coexistence" theory, he had enough. He began rightfully criticizing Khrushchev, to which the USSR responded by cutting economic aid. In the end this escalated in 1961 when the USSR cut diplomatic relations with China. From then on, the international communist movement split in 2, proUSSR or proChina. Albanias Enver Hoxha supported Maos criticisms, which ultimately led to the Soviet Albanian Split, in which Albania sided with China against USSR.
PD: This is obviously a simplification, research more yourself.
I dont know why, but many people here (mostly americans in my experience) are rabidly allergic to the word "patriotism". They seem to believe it means "jingoism" or "reactionary nationalism", when in reality those bourgeois ideas are completely antipatriotic and treasonous. There is nothing more patriotic than being a communist, fighting for the people of your country. How are you not a patriot if you love your people and want them to have the life they deserve, instead of the misery imposed on them by capitalism?
I would say most people here are proud patriots of their respective countries, but if you tell this to many american comrades here, theyll get up in arms about how actually patriotism is reactionary and they arent patriots, even though they are indeed patriots, they just dont admit it for some reason. It reminds me of some self described anarchists whose beliefs are basically marxism leninism, but theyll deny being MLs because "thats a bad tankie word". Truly a mistery why. Maybe its a reaction to the pervasive jingoism maskerading as patriotism in the USA idk.
Edit: To all the americans downvoting this, please read about the Communist Party of Greece (KKE), a very based party from an imperial core country which clearly states that they are patriots and that its their patriotic duty to oppose the EU and its imperialism.
Edit 2: Here are just 2 articles from the KKEs newspaper discussing patriotism and how its fully compatible with internationalism with quotes by Lenin:
https://www.rizospastis.gr/story.do?id=209459
https://www.rizospastis.gr/story.do?id=329397
Its in greek but just use google translate.
Edit 3: Article by the Communist Party of Spain (PCE) discussing revolutionary patriotism. The PCE is quite liberal and opportunist, but even they recognize that patriotism and communism go hand in hand. How much more evidence do you need?
https://www.mundoobrero.es/pl.php?id=10161