On Russian maps:

- red = own/friendly (Russians)

On Russian maps:

- red = own/friendly (Russians)

- blue = enemy (Ukrainians).

If there are blue circles in some place, then these are enemy positions.

And if there are blue circles, and then - right next to them - red pontoon bridges: well, then these blue circles are former Ukrainian positions.

What happened with the Ukrainian unit in question: no idea. That's something Kyiv should explain.