Citing security violations, Russian authorities booted South Korean’s Ko San off an upcoming Soyuz flight and replaced with his female backup, the Korean Times reports.
Barring any additional changes, 29-year-old mechanical engineer Yi So-yeon will become the first South Korea in space on April 8 when she lifts off with two Russian cosmonauts on a flight to the International Space Station.
During a press conference, Russian officials said that Ko had twice broken security protocols by taking training materials outside the Russian training center near Moscow.
