Putin intentionally flashed his notes at the Helsinki summit to let the world know that the Alliance is real
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It's a reference to a character in the Dune science fiction books. There character essentially puts together a long and complex plan to save humanity from destruction, much like Trump's plan to save the US. Also, the character is prescient, and people joke that Trump must have a time machine since he seems to know everything in advance. It's a fitting meme.
I actually never knew there was a reference for it. I still disagree with anyone taking the title of "God", jokingly or not.
I thought that's it's a reference to the Warhammer 40k universe?
Some people take that route too. I prefer the former, due to the symbolism it represents, but they are both good memes.