I understand that China may need Russia as an ally against their common enemy, US imperialism.I agree China can play a great role here
also they should pump billions into Russia to stabilise the Russian economy, Russian wont forget the favour even after 100 years
also China should learn the lessons where Russia failed
But unconditional support of Russia is not in China's best interests.
China should not blindly tie its fate to whatever decisions are made in the Kremlin.
A Chinese officer was studying at a Soviet military academy when the USSR was invaded in 1941.
Like all his classmates, he suddenly was drafted into RKKA. He served as a staff officer with distinction,
being decorated and promoted (if I recall correctly) to about a lieutenant colonel (give or take a rank).
After the USSR had been nearly cleared of Axis invaders in 1944, he requested permission to return to China.
The Soviets liked him so much that he was offered Soviet citizenship and a permanent career in the army.
While he felt sad to part from his Soviet friends, he believed that his duty was to serve his motherland.
He served as a general in the Korean War. After the Sino-Soviet split, he fell under suspicion due to his past.
His family (which might have had few other sources of income) in China did receive his Soviet military pension.