And only presents a problem because the 2 countries cannot reliably use air power to overcome 1st WW trench warfare

The US has just approved the transfer of F-16s to Ukraine. So that might change soon. IIRC, Ukraine has had a shortage of airplanes to use. Russia has been very reluctant to use the airplanes that they have because they keep getting shot down, and they simply can't replace them at the speed necessary (especially since their economy has crashed, and China is the only country that can supply them with the circuitry that they need).

A bigger problem is that Russia has air defenses and air bases inside Russia. NATO in general has been very reluctant to transfer offensive weapons to Ukraine that would make it possible to strike those--entirely legitimate--targets inside of Russia, because that would be an escalation. But to have air superiority, you need to ensure that those SAM batteries, RADAR installations, and forward air bases are not in the picture. So to break the stalemate, Ukraine has to be able to make strikes against Russia, in Russian territory. That's potentially very dangerous.

If it's allowed to grind on, Russia wins eventually, because they have a population many times the size of Ukraine, and can keep throwing bodies at them. So Ukraine needs to win air superiority, which means striking targets inside of Russia.