Yeah this is what a lot of people thought the Ukraine war would look like: Russia doing a successful invasion of most of the unwilling country which fights back in a guerilla warfare style. But Ukraine did better than expected and now it looks more like WW1 but with less gas and more drones. They do also apply guerilla tactics though.
In any case, the USA lost to the motorbike guerillas in Afghanistan, which is probably where the Ukrainians got the idea from.