I pulled them from the table at https://en.wikipedia.org/wiki/Casualties_of_the_Russo-Ukrainian_War#Total_casualties which seems to be kept fairly up-to-date with the reasonably credible claims, including the Meduza estimates. Original references are in the Wikipedia article.

I added the 30000 upper bound as a fudge for the Ukrainian military deaths because the one somewhat credible estimate from the US that table lists only covers up to May 2023. While Ukraine has been on the offensive since then, I don't think increasing the KIA numbers by more than 50% in 2 months is credible even under the circumstances.