CO2 in the atmosphere is also long lasting, do you have a problem with that type of storage?
Spent nuclear fuel is dangerous to stand near for 500 years (without centimetres of concrete), and then dangerous to consume for an further many thousand. It is within our technology to look after the quantities we are talking about indefinitely.
Also, with current plants we could reduce the size of the waste by 30x if we recycled it. Other plant types would burn all the fuel and leave us with very low volumes of radioactive elements.
Wrt Ukraine you choose to focus on the potential for release around Zaporozhzhia Vs the actual destruction occuring from the circumstances of war in the rest of the country?