I've seen on russian forums, they receive C - band even with 90cm dish from Express-AM1, 40E, TP6: EIRP value from this TP is 43(48)dBW for
European part of country: hxxp://www.rscc.ru/ru/satellite/zones/zone13.html, first pic from the left.
Also there is no adjacent sats, Paksat1 at 38E has a beam for Pakistan only, and on the East, next sat is at 49E:
hxxp://www.lyngsat.com/eam1.html
Here is a picture of this dish:
hxxp://www.album.alyno.ru/coppermine_alyno/albums/userpics/10001/M_40_53_60_001.jpg
Some more pics, with calculations for 53E Ku and 60E Ku, too:
hxxp://www.alyno.ru/old-forum/viewtopic.php?t=125&start=0
So, signal should be strong enough, and should be no interference from neighboring sats, in order to use small dish for
C-band