Hello Artem,
Many thanks for your post by discharge certificate do you mean like the one shown below:
The only way of finding out what awards he received would be via his Service Record.
You can guess that if he came from the Russian gulags and fought with the 2nd Corps he would have received the Medal Wojsko and the standard British awards : 1939-1945 Star, Italy Star, 1939-1945 Defence Medal.
If he was serving with the SBSK in Tobruk, you could add the Africa Star and the 1939-1945 War Medal.
I hope that the above is of some use and help to you Artem.
Best wishes
Andrzej
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