Οδησσός has two s in greek and is a city that is strongly related to greek history. The independence of greece from turkey started there... Therefore i don't really can write it with one s. Anyway this city rather sooner than later will surely be in the epicenter of the conflict. Right now and for some time will not be a good place to be because of the war. In other words Russia has said repeatedly that this city in particular will be theirs for sure... I wouldn't like to see you in the middle of an obviously very dangerous conflict...