Kedrov graduated from the Sea Cadet Corps in 1899 at the top of his class and served as a midshipman on the cruiser Gerzog Edinburgski.

He was not on the battleship Petropavlovsk when that ship was sunk (with the loss of the admiral and his staff) as he was detached to the destroyer Boyevoy at the time.

After recovering in hospital in Qingdao he made his way to Cam Ranh Bay in French Indochina, joining up with the Second Pacific Squadron.

He played a significant role in the Russian military emigration, and was chairman of the Naval Union, which consisted of more than 30 departments and groups in different countries.

After the kidnapping of Miller by Soviet agents in 1937, he served as chairman of EMRO for a short time and then withdrew from political activity.