the russians are technologically backwards. it's been a few years, so maybe they've finally completed the project of removing windows from sensitive russian computer systems. they had a backdoor to washington everywhere. the americans could practically write their policies remotely from the pentagon.
individual russian hackers are always a suspect.
but the russian government is actually not a likely suspect as they are not very good at hacking, despite the propaganda to the contrary in the west. the most likely suspect is in fact the chinese.