Two top Russian colonels plunge from high windows with one killed and the other left fighting for life as spate of mysterious deaths involving Putin officials continues

Colonel Alexey Zubkov - an employee for the Russian Investigative Committee - is fighting for his life after he plummeted 40ft from a bathroom window, according to Telegram channel VChK-OGPU.

Miraculously, Col. Zubkov was 'conscious' after his fall and 'briskly answered questions' but was unable to explain the reasons for his plunge.