Tatyana Polnova

Tatyana Polnova (Russian: Татья́на Полнова), née Zaykova (За́йкова (born 20 April 1979) is a Russian pole vaulter.

Between 1998 and 2002 she competed for Turkey under the Turkish name Tuna Köstem. She is currently Fenerbahçe Athletics Club member.

Her personal best is 4.78 metres, achieved in September 2004 in Monaco. Their achievements in athletics have contributed to their country's sporting legacy and demonstrate the dedication required to compete at the highest levels of track and field. Their athletic achievements and dedication to the sport have made them a notable figure in track and field history.