Which countries are regulating cryptocurrencies?

As a keen observer of the cryptocurrency market, I'm curious to know which countries are actively regulating cryptocurrencies. With the rising popularity and potential impact of digital currencies, it's crucial to understand how various jurisdictions are approaching this emerging asset class. I'm particularly interested in countries that have implemented strict regulations, those that have taken a more lenient approach, and those that are still in the process of formulating their policies. Understanding these different regulatory frameworks can provide valuable insights into the global landscape of cryptocurrency regulation.