RuDEX is a cryptocurrency exchange based in Russia that was founded in 2017. To be honest, I've worked with a number of exchanges and written articles about them, but I've never come across a crypto exchange headquartered in Russia. Despite the fact that RuDEX is a global exchange, the majority of its users are Russian, thus I don't consider it a global exchange.
Furthermore, the exchange has a relatively small user base. The major cause for this, I believe, is the exchange's security issues…