His campaign used stock footage supplied by their russian handlers just like kari lake and had to scramble to delete it after it came to light, most of his talking points mirror russian narratives, he constantly publicly defends russia, his position in us politics as spoiler on the left closely mirrors the strategy russia used with trump to dominate the republican party - only rfk is somehow less competent than trump.
It's just quite obvious from everything he does and says. I'm sure a little searching would turn up more examples.
While the photo posted on social media (which has since been deleted) says nothing substantial about the presidential candidate's feelings toward the nation, it does appear that the photo used in his campaign ad was produced in Russia.
John Scott-Railton of the cybersecurity research center Citizen Lab detailed in a series of tweets, posted on June 28, 2023, that the photos included Russian writing on a blackboard (thought to say "Tea and jam") and a shopfront named "Caesar."
The photo appears to be based on a mock-up used by online shops to illustrate their stock. It is among a selection of other photos offered by Dikarte Media, and has been used by online stores around the globe.
I'm not responsible for providing basic, widely known, public information. It's like asking for proof that the us government supports israel. It's a matter of public record.