Usually on a professional shop lift, with appropriate sized pry-bar(s), in conjunction with a pair of "whale jaw" vise grips locked onto the inner CV axle housing to turn the inner axle shaft, apply force, and "persuade" the inner axle lock ring coming out by using a rubber mallet on the vice grips, while turning and prying. (Use wood cribbing as needed when prying, to prevent damage to the transmission casing.) Putting it in Neutral (safely lifted / blocked!) as needed, to turn the axle to apply force evenly, may help release the lock ring from the transmission.