The Russian central bank did this on purpose. There is nothing special about the Russian economy. The devaluation of the ruble step by step is actually intentional by the Russian central bank. As we all know, dollar hegemony is one of the most important forces for the United States to dominate the world. Therefore, few countries in the world really dollarize, but now Russia has completely done it. It is precisely because Russia's national foreign exchange has been completely dollarized that the exchange rate between the ruble and the US dollar is meaningless, because there is no scene in which the two countries directly exchange the ruble for the US dollar. The reason why there is such an exchange rate actually reflects the exchange rate fluctuation between the ruble and the RMB.