Beijing has carefully avoided violating Western sanctions or providing direct military support to Moscow.
For the first eight months of this year, total goods trade between China and Russia surged 31% to $117.2 billion.
"Russia needs China more than China needs Russia," said Keith Krach, former Under Secretary of State for Economic growth, Energy and the Environment in the United States.
For China, Russia now accounts for 2.8% of its total trade volume, slightly higher than the 2.5% share at the end of last year.
"Russia's war in Ukraine is not in China's interest, but given Western hostility, China will not oppose Russia," she added.