Ukraine has already kicked the Russian Navy out of the Crimea. Russia has to lie to men in other countries to find soldiers to die in Ukraine. Russia is on its last leg and can’t last another 6 months.
Those who are pushing for Ukraine to give up land know Russia is about done.
Russia has more manpower than Ukraine. Putin's goal is to hold on to the gains. Right now, Zelensky refuses to stop until Putin withdraws all Russian troops from the occupied territories.