Could European & US F-35s Stop Russian Attack on Ukraine?
A sufficient presence of US and allied F-35s could quite likely overmatch Russian Su-57s in both performance and fleet size such that air supremacy could be established.
US Air Force RC-135 surveillance planes have been flying key missions along the Ukrainian-Russian border to monitor troop activity, track movements and ensure readiness in the event of attack.
Should the US, NATO and its allied force wish to avoid taking a potentially escalatory step of sending large numbers of ground forces to the Russian-Ukrainian border, there is an interesting argument for how they might merely choose to use surveillance planes and demonstrate air power, long-range precision weapons and the threat of Close Air Support to stop or eliminate invading Russian forces.
Close Air Support (CAS)
Such a strategic posture, likely to be fortified by visible air power demonstrations to support deterrence efforts, would show a mix of high-altitude bombing superiority with drones, reconnaissance planes and fixed-wing fighter jets in position to provide Close Air Support to defensive forces.
Now armed with US-provided Javelin anti-tank forces, a smaller and lighter Ukrainian defense force could stage hit and run guerilla-type attacks against Russian tanks and advancing armored vehicles. Such an effort, particularly if supported by long-range rockets and missiles capable of hitting Russian targets on the move, would be likely to succeed in the event Ukrainian forces were supported by US, NATO and allied Close Air Support.
The CAS mission, historically thought of in terms of the highly cherished A-10 aircraft, has in recent years been fortified by the advent of additional fixed wing assets such as the F-35 and F-22.