Three heroes

You were in your world, or rather in the present, you were an ordinary person, you had friends, and all that.

but one day you and your friends were walking around your city, and a portal appeared in front of you, you walked away but you were sucked into it

You woke up in some forest, and in the distance was... Kyiv? Yes, there was Kyiv, the same one from the cartoon, and three men were walking into the forest, dressed in the Old Russian style, with a helmet and armor, and they were larger than the average person.