Petr Lobkovsky was born in 1921.

He graduated from the flight school in 1941.

In June 1942, Kasatkin served in 926 IAP-PVO, flying Polikarpov I-153s with this unit. This unit operated in the Stalingrad area.

In September 1942, he was posted from 926 IAP-PVO to 629 IAP and continued to fly I-153s on the Stalingrad Front.

On 28 September 1942, Lobkovsky was killed in aerial combat.
It is possible that he was shot down by Unteroffizier Otto Wirth from 3./JG 3, who claimed an I-153 at 11:55 at 300 meters altitude, 6 kilometres east of Aktuba

At the time of his death, Lobkovsky was credited with 3 biplane victories.
This had been claimed during 150 combat missions and 35 air battles.

On 5 November 1942, he was decorated with a post-humous Order of the Patriotic War 1st Class.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1942
1	15/08/42		1	He 111	Destroyed	I-153			926 IAP-PVO
2	13/09/42		1	Bf 109	Destroyed	I-153			629 IAP
3	15/09/42		1	Bf 109	Destroyed	I-153			629 IAP

Biplane victories: 3 destroyed.
TOTAL: 3 destroyed.

Sources:
Soviet Fighter Pilots 1936-1953 - Mikhail Bykov