That is completely nonsense. Absolutely ludicrous.
Neither Russia nor China are homogenous. Both have large Muslim minorities (and both are be pretty racist against them). Eastern Russians are not European descended and are looked down on by Western Russians. Tibetans are not Han Chinese.
Even the Asian nations that actually are pretty "homogenous" like Japan and Korea are also famously pretty racist.
There are also a ton of other ethnic groups in China and the government just call them all Han Chinese. Tons of ethnic groups in Russia too. These are countries with very long histories that span a large area, with many areas that were multiple kingdoms, tribes, etc. Makes perfect sense that they would have a lot of different ethnic groups.
That is completely nonsense. Absolutely ludicrous.
Neither Russia nor China are homogenous. Both have large Muslim minorities (and both are be pretty racist against them). Eastern Russians are not European descended and are looked down on by Western Russians. Tibetans are not Han Chinese.
Even the Asian nations that actually are pretty "homogenous" like Japan and Korea are also famously pretty racist.