For everyone who has trouble learning to trill those R’s for Spanish, Russian, etc., here’s a video from a family in the region of Irkutsk whose 6 year-old son finally got the hang of it. In the beginning Mama helps him work on it, and at about 1:00 he shows his success to Papa: Семья Бровченко. Занятие с логопедом № 4 - мальчику 6 лет. Произносим звук "Р". - YouTube
This is #4 in a series over a couple of years, so apparently it took him a while to get this far. The kid is so happy, though, and his parents so happy for him. There’s a follow-up video where he gets it without the aid.