The touchdown on a snow-covered steppe also marked the return to earth of Italian astronaut Luca Parmitano and Russia's Alexander Skvortsov.
Koch's 328-day space mission broke the record for the longest continuous stay in space by a woman, previously held by NASA's Peggy Whitson.
Launched into orbit last March, Koch's mission was extended in April from its original span of six months to nearly a year after she was already aboard the station.
She also achieved a gender milestone in a relatively routine spacewalk with fellow NASA astronaut Jessica Meir last October that marked the first time two women stepped out of the space station at the same time.
VIDEO: REUTERS
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