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What they have falls short of a defense pact. The "Treaty of Good-Neighborliness" contains language that the countries shall immediately discuss military options when under attack, but an agreement to talk is not an agreement to join a war.
This is what article 9 says: "When a situation arises in which one of the contracting parties deems that peace is being threatened and undermined or its security interests are involved or when it is confronted with the threat of aggression, the contracting parties shall immediately hold contacts and consultations in order to eliminate such threats."
Russia and North Korea have a newly signed defense pact (https://www.nytimes.com/2024/06/20/world/asia/china-russia-n...). I don't believe Russia and China do, though.
They are absolutely allies, though. Per Putin himself. https://www.reuters.com/world/putin-says-china-is-russias-al...
I'm no fan of the CCP either but really what do they stand to gain here? Getting dragged into Russia's conflicts and the sanctions that would ensue would be devastating to the Chinese economy and security of the CCP's control.
The CCP are aware of this fact and they're planning for it, but they're not ready yet.