POWs pile up in Kursk, RUS

Ukraine's army in the Kursk region is taking many prisoners; they say Putin's conscripts often don't want to fight.

It makes sense that they don't; so when Zelenskiy says that prisoners of war become part of the "exchange fund" to swap for Putin's Ukrainian prisoners, that creates a moral quandary. If a Putin forces soldier surrenders in order to get out of the Putin forces, swapping him back to Putin would spoil the point of his surrender.

Does Ukraine give each prisoner the option not to be traded?