Why is Russia not in G7?

Russia was excluded from the G7 in 2014 after it invaded Crimea, and its continued disrespect and flaunting of international rules and norms is why it remains outside of the G7, and it will continue to remain out.

Further details on Group of Seven (G7) is available on the given link.

Further Readings-

1. List of Important Summits in 2021 
2. Carbis Bay Declaration – G7 Summit 2021