It seems to be Polish. The drawing I found shows a uniform with has more accessories, probably your photo pictures a young private with low or no grades:

https://dobroni.pl/fotka-historyczna/14000

Another picture shows similar numbers on the collar: https://ar.pinterest.com/pin/510173464030294530/?nic=1

It seems to be Polish.

https://dobroni.pl/fotka-historyczna/14000

This drawing I found shows a uniform that has more accessories, and this may lead to confusion. I assume your photo pictures a young private with low or no grades.

Another picture of a Polish soldier clearly shows similar numbers on the collar: https://ar.pinterest.com/pin/510173464030294530/?nic=1