About 70 % of the radiation from neighboring Ukraine 's 1986 Chernobyl nuclear disaster entered Belarusian territory , and about a fifth of Belarusian land ( principally farmland and forests in the southeastern regions ) was affected by radiation fallout .
About 70 % of the radiation from neighboring Ukraine 's 1986 Chernobyl nuclear disaster entered Belarusian territory . The farmland continues to be affected by radiation fallout .