#ukraine is becoming the biggest real testfield for military hardware in Europe
Even if those weapons have been developed for the wars in Afghanistan and Iraq, they have never been tested in real war in Europe with another climate and other battle conditions. So both sides are starting to send their newest military hardware to the Ukranian battlefield (this is what it is really, sad to say) and to learn what works and what should be changed - especially in the new doctrine of waging or combating a Hybrid war (which is even different from the kinds of wars that are being fought in Iraq and Afghanistan).
for those interested in the networking of the battlefield, you will see that secure communication is part of the infrastructure and the success of these military hardware
This is in fact a big argument for NATO or other countries or even industries to get their newest weaponary to Ukraine so they can achieve some military balance and keep the conflict under control as long as there is no diplomatic solution and have a learning process that no exercise can give. When it comes to real or limited war somewhere on our Eastern European borders than those leassons will be very important. The Baltic states surely think so.