I'm assuming you're asking in good faith:
Patriot. NASAMs. SAMP-T and IRIS. All proving themselves at least as good as any Russian SAM system.
ATACMS, GMLRS, HARM, Javelin, TOW, Gepard, PZH-2000, M-777, Paladin, SCALP/STORM, Bradley... The list goes on. Of course the Ukrainians are not being provided with enough equipment and munitions to actually win, but the equipment itself is dominating when used in even a close approximation to sound strategy.