https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7197787/
This study from 2020 found an 89% increase, which is a large effect size, but it’s still just 1’s of people per 100,000 more getting cancers. It’s not a massive public health hazard. War is complicated.
Regardless the effects are highly localized. You’re fine if you’re not nearby.