I'd skip Belarus purely on the fact that you need to arrange a tourist visa for it at the embassy, which is a headache. Every other country in your list, you just show up at the border with your passport.
In Ukraine, I'd say Lviv and Kiev at least. Odessa definitely worth a stop. But if you aim for Lviv before Chernobyl, you will be going through Katowice and Krakow in Poland, which should be worthwhile.
In Romania - the big famous sites are the Transfagarasan road and Brasov with the nearby Bran Castle. I'd also recommend the Turda salt mine as a must-see on a road trip. But there are lots of great light-trafficked roads elsewhere in the country, e.g. the Semenic and Cheile National Parks in the southwest (aim for the Bigar Cascades for example). Bucharest worth a stop as well, go to the giant government palace, and take a walking tour for the mix of 19th century Paris and 20th century Eastern Bloc architecture.
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