I saw that movie on TV sometime in the late ‛90s or early ’00s.
It is some sort of fairy-tale for young people. I think the main character was a girl. Perhaps there was also some witch or sorceress character.
I remember there was an episode where there was an eel in a bathtub, and later it grew a lot in the very same bathtub.
Although this is probably not very helpful, but I also remember a moment, where there was a panoramic view from some high point (perhaps from a high floor or a roof of a building) during a sunny summer day, that showed an articulated Ikarus bus passing through some residential area.
I also think there were some inscriptions in Latin script, which, together with the Ikarus bus makes me think it was filmed in a Soviet or post-Soviet country, like Czech/Czechoslovakia or something like that.

I tried to find this movie on my own multiple times, but I was unable to due to very vague (and most likely incorrect) information.
So, I watched this probably sci-fi action movie in a cinema in the ’90s (most likely between the mid and late of ‛90s, but not later than that). The movie itself may be much older however.
I was a really small kid back then and I most likely remembered and interpreted most of things incorrectly, but here is how I remember it.
I tend to think it’s European (French, German, British or so), but maybe it is American. I also tend to think it was black-and-white, but maybe it was just in depressive colors.
It seems it was about a war, perhaps WWII, or maybe just some fictional war, and some people managed to go back in time and change the course of that war. Or, those weren’t travels in time, but travels between alternative universes. And they used doors to travel. Or at least I think they did. 😂
I remember at least some of the action happened within half-ruined buildings similar to those during WWII.
Well, at least there was a point in a movie where they were walking through doors a lot, shooting each other in between, somewhere in the 2nd half of it.
Can’t name any actors, but I probably didn’t even know any back then anyway.