Thanks. I did a search on Brave (Google? No, thanks.) for Denis Kireev.
There are conflicting reports, but the most common one seems to be that he was accused of being a double agent. He had been involved in the first round of negotiations with Russia. UKR sources are saying he was a double agent, a spy, a traitor. He is dead. Some hits say he was executed. A few say he was killed during arrest.
Did we know this Space Force guy left?