This cannot be controlled using the POW algorithm.
It doesn't really have anything to do with the algorithm. It has to do with OFAC and sanctions.
The Office of Foreign Assets Control ("OFAC") of the US Department of the Treasury administers and enforces economic and trade sanctions based on US foreign policy and national security goals against targeted foreign countries and regimes, terrorists, international narcotics traffickers, those engaged in activities related to the proliferation of weapons of mass destruction, and other threats to the national security, foreign policy or economy of the United States.
Not all mining pools comply with US requirements, and for a good commission, prohibited transactions will be included in new blocks. In Russia, miners will not obey US requirements, so Russian miners will receive more profit.
https://ofac.treasury.gov/sanctions-programs-and-country-information/russia-related-sanctions