Ukraine and Belarus
Because the area where Chernobyl is at is very close to the border of Belarus, and they received much of the fallout.
The contamination from the Chernobyl nuclear disaster spread across Europe and beyond, with varying levels of contamination detected in different regions. The most heavily affected areas were in Belarus, Ukraine, and Russia, but radioactive particles were detected as far away as Sweden and Scotland.
Chernobyl is in northern Ukraine, near the border with Belarus.
About 616 miles to Moscow from Chernobyl.
Chernobyl "Contamination from the Chernobyl disaster was not evenly spread across the surrounding countryside, but scattered irregularly depending on weather conditions. Reports from Soviet and Western scientists indicate that Belarus received about 60% of the contamination that fell on the former Soviet Union." -Wikipedia
From Oslo, Norway to Minsk, Belarus, the distance is approximately 1,230 kilometers.
About 988.8 KM :)
The Chernobyl Children's Project International has set its goal to be to work with the people of Belarus to help them overcome poverty. They hope to provide a permanent solution to bring the people up to self-sufficiency.
Chernobyl is neither a capital, nor a country. Chernobyl was a city close to the Chernobyl nuclear power station. The power station actually sat close to Prypiat Ukraine, where many of the workers lived. It was close to the Ukrainian and Belarus border. It became famous for having a large nuclear disaster on 26 April 1986. The city is now abandoned and is a ghost city inside the Chernobyl exclusion zone.
The location of the Chernobyl Nuclear Power Plant in the Ukraine-Belarus border can be seen in Google Maps or Google Earth at the coordinates 51°23′22.39″N 30°05′56.93″E.
Pripyat is located in northern Ukraine, close to the border with Belarus. It is around 2 km from the Chernobyl Nuclear Power Plant.