Transformers: Portal (Трансформеры Портал Transformery Portal) is a licensed animated web series exclusive to Russia, which began in September 2016. Designed by Marvelous Group, the series depicts a crossover between the 2015 Robots in Disguise and Titans Return franchises (https://tfwiki.net).

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Throughout the Earth, the appearance of portals of unknown origin has been noticed. Humanity is in a panic. Bumblebee gets in touch with a mysterious message. What's next? (Youtube)
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Throughout the Earth, the appearance of portals of unknown origin has been noticed. Humanity is in a panic. Bumblebee gets in touch with a mysterious message. What's next? (Youtube)