While there wasn't any pressure from Germany which forced us to attack the SU and it was a voluntary action after that they continuously urged us to ramp up the war effort and send more troops and equipment to the front. Our leadership was cautious in this. What we had wasn't much and they tried to preserve what they could in case of an post-war settlement would need to be done so we wouldn't stand there without an army like before Trianon. It's a myth tho that we sent the 2nd Hungarian army underequipped (albeit it was highly understaffed/undersized/underpowered compared to a German army) and this event the sending of the 2nd Hun. army in '42 April-June started the process of handing over German war materials (first mainly simple AT guns not the self-propelled types and not necessarily German but French or Belgian for example, then even airplanes).