This war has now turned into a grind. As you have mentioned, Russia's losses are mounting. They are already having to strip garrisons in other parts of Russia to replace depleted formations and are bringing in foreign fighters. Flow of aid into Ukraine will only grow. Don't know much about Ukraine's manpower situation but they seem to have enough mobilized to make the war a grind for Russia.
Some say the Russians haven't used all their troops. Sure looks like they are rather close to doing so. There are manpower commitments in other places in Russia that must be met.
Kyiv could be the Stalingrad of this war. Russians could take part of the city but be eventually driven out.
Unless there's some sort of negotiated settlement this war could go on for months. Should that happen spring planting and harvesting of winter wheat planted this past fall in the Ukraine will be affected. Russia may have problems exporting their grain. Then Ukraine faces a large rebuilding job. We shall see charitable appeals for Ukraine for the foreseeable future.