I should structure the paper by first introducing Ok.ru and its significance in the Russian market. Then discuss two key events or developments from 2021. If there's not enough public information, I might need to focus on what's available or make educated guesses based on trends. I'll have to ensure the information is accurate and cited properly. Also, considering the user might be a student or researcher, the paper should be well-structured with an abstract, introduction, sections for each event, analysis, and conclusion. I need to mention any limitations in the available data and suggest areas for further research.