I've personally wondered why they don't instead focus on the Russian forces and equipment operating on the frontlines in Ukraine.
You really wonder why?
Because taking out things like A-50s while they're on the ground degrades Russian command and control of their aircraft, enhancing the risk of the loss of those aircraft, making them less effective and less often utilized against Ukrainian civilian populations and military forces, and degrades the Russian ability to detect incoming Ukrainian aerial strikes and detect Ukrainian aircraft flying ground support missions.
Because taking out things like Tu-22s on the ground means fewer bombs and Kh-22 missiles hitting Ukrainian cities, infrastructure, and ground forces, and forces the Russians to stage their bomber fleet progressively further away (Arctic Circle, Siberia), giving Ukraine more warning time to prepare for and potentially intercept incoming airstrikes.
Because taking out a significant portion of the Black Sea Fleet defeated the Russian blockade, allowing Ukraine to re-open a vital import/export corridor to the rest of the world. This also forces the Russian Navy to base further away, neutralizes it as a threat, and removes the missile tubes on surface ships and submarines from the equation in conducting missile strikes against Ukraine.
A nation without a navy won the Battle of the Black Sea. Imagine that.
Because hitting Russian oil and gas infrastructure deprives the Russian government of easy revenue, forcing it to raise taxes on its citizens, forces its citizens to endure rising prices and shortages, forces the Russian government into arrears forgoing payments to its domestic arms manufacturers and military suppliers, forces it to liquidate its gold reserves, and forces the Russian federal and regional governments to slash bonuses for men signing military contracts, thus making military service a less lucrative endeavor.
Because hitting ammunition storage sites behind the front line means Russia has fewer shells to fire at Ukrainian ground forces, and Russia is forced to stage these sites further away, making their logistical lines longer and more complicated, forcing them to use more men and more trucks to maintain levels of supply to the front line.
Because hitting radar systems in Russia makes it easier for Ukraine to do all of these things.
I could go on for days.
I feel bad I had to break this down for you. This is Captain Obvious stuff.