Firstly, many people are unaware that China is also a major oil producing country, with its proven oil reserves ranking among the top ten in the world. China used to be a major oil exporting country. In 1990, China was one of the top five oil exporting countries in the world and the largest oil exporting country in the Asia Pacific region. At present, China's reduction of oil mining output and large import of oil are actually just to balance the trade surplus.
Secondly, the National Development and Reform Commission of China stipulates that the amount of oil imported from any single country cannot exceed 20% of the total import volume. The proportion of oil imported from Russia now is 19.8%, and its growth is limited by the policies of the Chinese government, rather than the limits of the China Russia oil pipeline. If necessary, the China Russia oil pipeline can grow by 5400%. However, Iranian oil accounts for only 7%.
Some people who believe that US attacks on Iran and Venezuela can influence China may need to have a better understanding of China. By the way, the main countries currently facing crises are Japan, South Korea, and India. The manufacturing industries of Japan and South Korea are collectively fleeing to China, while India, as far as I know, has only 20 days of oil reserves and is still a truly oil poor country.