This is an attempt to make money on the sale of energy resources
Russia is trying to compensate for the low volume of energy sales and the discounts they are forced to make with the high price of the dollar

An important factor for the ruble is oil prices, which may affect its dynamics
The Central Bank explained the weakening of the ruble
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Currently no
The yuan is not a freely convertible currency. It can only buy Chinese goods.

The PRC is the world leader in the production of most industrial goods. This is facilitated by the weak exchange rate of the yuan against the dollar. If the yuan becomes the world's reserve currency, it will strengthen against the dollar, which means that China's industry will lose its competitive advantages.
Can the yuan replace the dollar?
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No
In 1994, the USA, England, France, and Russia concluded an agreement to cease the production of fissile materials for nuclear weapons. China did not sign the agreement but committed to comply with it. Israel also did not sign the agreement but stopped producing nuclear weapons in 2004, retaining the right to resume production if necessary. India, Pakistan, and North Korea, of course, did not sign the agreement. This agreement is perpetual, and its provisions came into effect in 1997.

Plutonium-based nuclear weapons have a shelf life of 18 years. 1997 18 years = 2015. Also, striking military targets, rather than cities, is the priority of a nuclear attack.
WHY THE US ELITE IS NOT AFRAID OF A NUCLEAR WAR WITH RUSSIA. I'M TALKING ABOUT RUSSIA AND THE USA.
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If production rates are not reduced and new deposits are not discovered, then in 2040
Russian Energy Minister Novak noted in 2018 that oil production in Russia, in the absence of incentives, could fall by 44% by 2035. Taking into account the coronavirus infection in 2019 and sanctions, these deadlines have shifted to 2040.

Russia has one of the highest taxes on the oil industry in the world, which makes it difficult to stimulate production.
Novak: oil production in Russia in the absence of incentives may fall by 44% by 2035
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