Here's why experts say Russia and China's attempts to 'de-dollarize' global markets are going nowhere

• Plans by Russia and China to challenge the dollar on the world stage are going nowhere, experts say.
• Russia's fragile economy and China's capital controls make both their currencies less appealing. 
• It'll take a long time for any significant challenge to be mounted against the US dollar, sources told Insider. 

Russia's attempts to combat the supremacy of the US dollar are unlikely to work, experts say, even as the country cozies up to China in a move to to challenge the greenback with an alternative reserve currency.