Only 12 months? Impossible. The war will continue at least till elections in the US, where question of Ukrainian support shall come as potent engine of rat race vehicles. Zelensky is unable to stop war without loud and clear call to armistice from Rammstein coalition, for he will be hanged the next day. Or the next day after Ukrainian elections, for that matter (they are scheduled in about a year, but, of course, shall be permanently delayed due to martial law).