Neat improvised portable heavy gun mount. I don't know if it's from Ukraine, but I wouldn't be surprised. 
Looks like a Soviet NSV 14.5 X 114mm heavy machine gun. It's been in service since 1949. The Russkies are using them in Ukraine and of course the Ukrainians have many of them also. They weigh over 100 pounds, unloaded, they are anti-personnel, anti-aircraft and anti-light armor vehicles weapons. Normally they have a Trtipod mount that weighs about 60 pounds itself but this modification using a wheelbarrow seems to make it more mobile.