Nadia Savchenko has been refusing food since December 13 last year . Helicopter navigator now declining glucose injections keeping her alive . Human rights advocate Yelena Masyuk warned she is on the brink of death . Prison service rebuffed claim - saying the pilot was stable at the moment . Savchenko is charged with being involved in Ukrainiann reporters ' deaths . But 33-year-old says she is innocent and has been kidnapped by Ukrainian .
Nadia Savchenko has been refusing food since December 13 last year . Helicopter navigator now declining glucose injections keeping her alive . Human rights advocate Yelena Masyuk warned she is on the brink of death . Prison service rebuffed claim - saying the pilot was stable at the moment . Savchenko is charged with being involved in Russian reporters ' deaths . But 33-year-old says she is innocent and has been kidnapped by Russia .