ACCORDING TO SNOPES
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"The Washington Post included the image in an article published on 18 November 2016 about how Russians in the city of Obninsk were planning to rally in support of a Trump presidency:
The demonstration was organized [by] Artyom Mainas, a 27-year-old blogger in Obninsk, a nuclear-research center 60 miles south of Moscow. He decided to act after seeing news from the United States about demonstrations against Trump’s election.
“I believe it is very important to support him here in Russia,” said Mainas.
However, while the billboard is genuine, it is not in Russia (as might be inferred from its use illustrating a story about Russia's support of Trump), but in the Balkan country of Montenegro. "