China has no imperial ambitions. They regard Russia as a historic aggressor.
Right as China was losing the Opium War to Britain and France, the Russia militarily threatened them into ceding 600,000 square kilometers including the prized warm water port that became Vladivostok.
The Soviet Union collected the debt incurred by China’s communist revolution in a very brutal way. When the money ran out, China paid the national debt in eggs. I’m told by the son of a Chinese political figure that the process used by the Russians to collect the debt was having every single egg was laid on a hoop. The eggs which were too small fell through and broke on the ground, because . . . fuck you. Because Russia wants to intimidate. Always.