The F-16 was a huge upgrade compared to legacy Soviet aircraft, especially considering the use of AAMs with active and semi-active radar, a capability the Ukrainian air force lacked. However, very little was added to counter Russian air power, mainly because the Russians are no longer attempting to penetrate Ukrainian airspace, thus avoiding attrition. Combined with long-range attack capabilities, this attrition will only occur if Ukraine starts exploiting more kills within contested airspace, but that would also put Ukraine at an imminent disadvantage. The situation for Ukraine has no possible long-term solution unless they obtain stealth ISR drones, stealth aircraft, and AWACS with wide coverage, which evidently will not happen. Even then, it doesn't depend on the platform itself but on the combined SEAD/DEAD capability, because the Russians have a very comprehensive IADS apparatus to counter these platforms.