Under no circumstances can Russia be considered a junior partner to China, none whatsoever.
My reasoning is simple. Russia is still a Marxist country. They still more Marxist than China, even though China calls itself a communist country, meaning China is more Marxist than Russia, even though in reality I believe the Russian mentality is more Marxist/socialist than the Chinese would ever will be.
Are there junior partners in Marxism? No, that is exploitation!
Junior partners and vassals, exist to be exploited!
Russia and China relations are based on equal partnership based on principles of the win-win.
When Putin and Xi declared an unlimited friendship at the Beijing Winter Olympics games, that was what they meant, a friendship of equals. Under no circumstances can we believe Russia just declared itself a junior partner of China in mid February of 2022.
(Of course, by late February of 2022, Putin ordered the special military operations, well, you know, Xi did not see that one coming, but have to make the best of a uneasy situation.)
Labeling Russia a junior partner or vassal of China, has no relevance here. That is not how Russia and China see their relationship, which according to Marxism, it is a relationship of equals.
That is why most of the world outside of the West who still hold imperialistic impulses, the rest of the Global South would prefer not to be exploited in these Western lead power relationships, and since the Global South more Marxist leaning in their outlook, are very receptive to what China has to say and to what China has to offer.
Honduras did not switch sides to recognize China to be a junior partner, they did it so they can try to release themselves from under the shadow of US hegemony.
That is the difference. Honduras is a junior partner to America, but Honduras is an equal to China.