Leonid Grekov was born in 1913.

He graduated from Orenburg flight school in 1936.

When Germany invaded the Soviet Union on 22 June 1941, kapitan Grekov served in 169 IAP. This regiment was equipped with Polikarpov I-153s and operated on the Western Front.

On 12 August, the regiment was withdrawn from the front to re-equip with MiG-3s.

On 28 September, 169 IAP became operational on the Volkhov Front with MiG-3s.

Kapitan Grekov was killed in action on 29 October, when he parachuted from his damaged fighter and was killed by enemy fighters.

At the time of his death, Grekov was credited with at least 1 biplane victory and a total of 4.
These had been claimed during 65 combat missions and 14 air combats.
The exact numbers of victories for Grekov had never been fully established due to lack of operational documents.

On 27 December 1941, Grekov was decorated with a posthumous Gold Star of the Hero of the Soviet Union and the Order of Lenin.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1941
	??/08/41		1/?	Bf 110	Shared destroyed	I-153		Western Front	169 IAP
1	??/08/41		1	Ju 88	Destroyed	I-153		Western Front	169 IAP
2	??/??/41		1	Enemy aircraft	Destroyed				169 IAP
3	??/??/41		1	Enemy aircraft	Destroyed				169 IAP
4	??/??/41		1	Enemy aircraft	Destroyed				169 IAP
	??/??/41		1/?	Enemy aircraft	Shared destroyed				169 IAP
	??/??/41		1/?	Enemy aircraft	Shared destroyed				169 IAP
	??/??/41		1/?	Enemy aircraft	Shared destroyed				169 IAP
	??/??/41		1/?	Enemy aircraft	Shared destroyed				169 IAP
	??/??/41		1/?	Enemy aircraft	Shared destroyed				169 IAP

Biplane victories: 1 and 1 shared destroyed.
TOTAL: 4 and 6 shared destroyed.

Sources:
All aces of Stalin 1936-1953 – Mikhail Bykov, 2014
Soviet Aces 1936-1953
Soviet Fighter Pilots 1936-1953 - Mikhail Bykov