Both embraced western ideas and worked to bring Russians fully in European cultural and political life
Peter and Catherine were both leaders who reformed Russia.
Peter reformed Russia by expanding the land holdings of the country to include a warm-water port. He then moved the capital and built St. Petersburg to resemble the modern European countries of the time. Peter also reformed the military and required modern look and dress for the wealthy of the country.
Catherine reformed the country to bring in more say from the people. She brought in Enlightenment ideas allowing for aides to inform her decision making. Catherine also worked to end serfdom and expand Russia's industrial ability.