It is difficult to definitively say who would win a war between China and Russia, as there are many factors to consider. Both countries have large militaries, though the Chinese military has a larger number of troops and a larger budget. However, the Russian military is generally considered to be more experienced and better-equipped, with more advanced technology and a larger nuclear arsenal. Additionally, the geography of the two countries would play a significant role in any conflict, as China has a more extensive coastline and more access to sea power, while Russia has a larger land border and more natural defensive barriers. Ultimately, the outcome of a war between China and Russia would depend on a wide range of factors and would be difficult to predict with any certainty.