It’s not just the Russian bots, there’s little that can be done about foreign actors
The next level down is the professional agitators, Yaxley-Lennon, Grimes, Oakshot, Farage et al. Then below that there’s the David Atherton types, the well know keyboard warriors hiding their views behind politics. laws already exist to deal with these people. OFCOM needs to get tough with the Social Media companies, every organisation that has prosecutable powers needs to use them, extensively and to the fullest extent.
Take those levels out and it becomes harder for them.
And yes, it’s a big ask that isn’t without its dangers.