What next for Ukraine?

Here's my fear for both Ukraine and us in the West. This Sunday on the tv the Ukrainian ambassador to the US viewed the opinion that the war will last till the last Russian soldier has gone not only from the newly gained territory but also the whole of Donbas and Crimea. That means that they're now not only going to fight a war that started way back in 2014 but also that they'll keep the West under a blanket of constant moral chantage. They are the democracy that needs to be saved, as the grand damsel in a fairytale. However, lets not go into that rabbit hole. Realpolitik has been in existence since Cardinal Richelieu supported the protestant side in the Thirty Years War in order to weaken the Habsburg monarchs. Whatever the detail of the Israeli policy towards Ukraine is today, it will for sure be in the interest of the country first. Does one actually need to get the Russian Army reduced to almost nothing in the long run, but rather have the conflict settled with the less death possible and as soon as possible? Remember, the summer months of July and August will favour the Russian armoured columns the most, and furthermore, they consider the battlefield tactical nuclear strike as mere the another artillery option. Obviously Ukraine won't defeat Russia on their own. Will their next step not be trying to directly involve the West in the war? That will mean that the war will only end by either regime change in Moskow, or by the West really taking the crazed bet that the Russians won't use the nuclear option whilst they bomb their army out of Ukraine.