They can buy iPhone or expensive cars and clothes from China, India, Brazil, and in other places. Your claim here makes no sense.
The true aim of Russia is to break the US Dollar fiat currency, By selling oil and gas outside of the US Dollar, with the banking of China - the largest economy in the world, they're at minimum starting the process of loosening the teeth the Western elites built around the rest of the world by financially suffocating anyone they don't like. The Russians and Chinese are onto something here.
Today, the trade between Russia and China or between Russia and India is done their own currencies and no US Dollar is in the middle. This wasn't the case a few tears ago.
It is better not to look at things simplistically.