more likely they realized how successful Putin had been and Cummins decided to copy him.
I'd disagree, David. There's too much 'Russian connection' with both Trump and Johnson. To bring it close to home, Cummings spent three years in Russia, nobody seems to know what he was up to there, apart from failing to run an airline.
Johnson has connections with Russians who have been part of the Putin regime and there is the matter of large Russian donations to the tory party. It's pretty clear that many 'donations' to the tory party are, in fact, bribes which create obligations in the recipients, or 'rewards' for obediently carrying out the donor's wishes (look at the Jenrick affair).
It has been Putin's overt policy to destabilise the EU and the tory party, directed by Cummings, are busily implementing this policy (or trying to; I don't think that our leaving has quite the destabilising effect Putin was hoping for).
It's obvious that there is something in the Russian Report which Cummings/Johnson doesn't want us to know...
None of this says 'copying' to me. It says complicity...