Russian Prime Minister Dmitry Medvedev recently gave a speech that included mention of a four-day week:

“It’s quite possible that the future belongs to the four-day week as the foundation of the social labor contract,” Medvedev said as an example of what corporations may offer laborers in the future….

Speaking to the 108th Session of the International Labor Conference in Geneva, the chair of the Russian government said nations should brace themselves for major changes in how labor works due to technology.

So you can add him to Carlos Slim, Richard Branson, Jack Ma, and other Global Thought Leaders™ who have talked positively about a 4-day week.