Once upon a time the land belonged to UKR. So it is not Russian land, except taken by force.
Event: The U.S. Embassy in Kyiv assesses that during the next several days and through the weekend there is an increased risk of both nighttime and daytime Russian drone and missile attacks throughout Ukraine in connection with Ukraine’s Independence Day on August 24.
https://ua.usembassy.gov/security-alert-message-for-u-s-citizens-ukraine/
As I understand it they annexed the 4 oblasts so along with Crimea they are Russian territory at least under Russian law