Two Finnish men painted a Russian consul's parking spot with Ukrainian flag colors on Wednesday.
The idea first came from Virtala, who told Insider he showed up in a hi-vis jacket to appear more like a maintenance worker.
Mattson, whose partner is Ukrainian, wrote on social media: "We held a two-man referendum on annexing the parking spot to Ukraine."
Virtala, a self-employed property manager, told Insider that after the paint dried, the diplomat's car returned.
"If Ukrainians ask me to, I'd be happy to do my part in washing off the colors," Mattson told Insider.