That was never the objective. A speech was given by Putin himself describing the intention of the military operation and he never once mentioned capturing the capital or taking over the country.
DeNazify and DeMilitarize Ukraine, protect its citizens in Donbas and eliminate NATO threats inside Ukraine which is what has been happening. Mariupol Azov stronghold has been liberated and remaining Nazis are surrounded in a steel factory with no food or ammunition being waited out. Putin told his troops not to even storm as planned after surrender deadline passed but to let them surrender when they are ready in defeat. Russia has actually been showing a lot of restraint by issuing all these surrender deadlines instead of just liquidating every last one of them. The whole blood thirsty genocidal Russia narrative is falling on its face.
Donbas is currently being defended by DPR while Russian army bombs Ukraine military targets within it.
Luhansk region is in majority control by Russia.
Russia controls Ukraines access to the Black sea.
Military aid being sent to Ukraine can't be verified what is happening to it. Is it getting there? Getting taken or destroyed by Russia?
Now how are they losing again??