Well even the top guys have bias so you have to choose who you like to follow but personally on Ukraine I like @general_ben who was Commanding General of the US Army Europe and also Mike Martin @ThreshedThought who wasn't a general but was an officer fighting in Afghanistan and has a PhD in War Studies, teaches at Kings London and written various books.
There are also a bunch of scientist on twitter. Personally I followed the lab leak stuff and pro lab leak you have @R_H_Ebright Professor of Chemistry and Chemical Biology at Rutgers and anti you have @MichaelWorobey, Professor and Head of Ecology and Evolutionary Biology at the University of Arizona. Both pretty outspoken, especially Ebright. I guess they have tenure.
It's sometimes interesting to follow both sides a bit when there's an argument going on.