It will still be a manged exchange rate and they will target inflation as they move forward. I am not a financial expert, even less of one in wartime economies, but their plan to end the fixed rate seems measured, reasonable and straightforward.
Can't manage without sufficient foreign currency reserves. You don't depeg during a war because of "economic normalization" when your economy has collapsed by like 30% in the past year and you've bled half of your able-bodied men to either the frontline or the border.