Russia's battered ruble dropped Monday to its lowest point this year as Asian and European stock markets nose-dived over concerns about the Chinese economy.  

Russia's dollar-denominated RTS index fell 4.21 percent at opening as the ruble tumbled to 70.92 against the dollar, its weakest against the greenback since December 2014.

The ruble-denominated Micex meanwhile dropped by 1.76 percent.