That is the way to prolong the war and nothing about it is normal.
The only way to stop an invading force is to hit them where it hurts which is hitting Russian infrastructure on Russian soil.
Look at any other invasion in the history, they never end by fighting the war in the invaded territory. WW2 didn't end because Nazis were defeated in the front-lines kilometers outside Germany or for example the invasion of Yemen stopped the day the armed forces of Yemen managed to attack their invaders' infrastructure inside their own soil (eg. Aramco in Saudi Arabia, UAE airbases and US military bases in the region, etc.).
Of course that is not something that United States would ever allow Ukraine to do which is why they never send any strategically important weapons (eg. MBMs and LBMs) to Ukraine.
If Ukraine uses ballistic missiles to target Russian infrastructural facilities, then the latter in all probability will retaliate with nuclear strikes. And that will trigger a new world war, where no one is going to win. Even if NATO manages to nuke 90% of Russia's territory, the Russians will destroy NATO with nuclear weapons from the remaining part of their land. As of now, Russia has 5977 active nuclear weapons. They have some of the best ICBMs in the world. I guess they need less than 1% of that number to completely annihilate any life form from this planet.
In the end, if a nuclear war happens by any chance, then no one will win. All forms of life will be wiped off.
What's the point of supplying Ukraine with average weapons if the Russia isn't going to surrender? And if Ukraine is going to win the war, won't Russia use nuclear bombs? If there are no changes in Russia, the ww3 is just inevitable since there is no diplomatic way to finish this war because Russia wants to achieve it's goals while the Ukraine isn't going to give them territories, which of course Ukraine shouldn't give them.
I think that the USA and allies were trying to win some time, weaken Russia by supplying Ukraine and sacrificing Ukrainian soldiers and probably make/fund some inner changes in Russia that includes massive protests from the people inside but sadly that hasn't happened and more likely isn't going to happen in near future.
So, if this fails and seems it's going this way, then the only option would be to give advanced weapons to Ukraine to be able to bomb Russian territories. This is bad but inevitable, we have to understand it.