There's not necessarily a conflict between Trump supporting radical Ukrainian nationalists and supporting Netanyahu's Israel. Ukrainian nationalism might have targeted Jews in WW2, but WW2 isn't the paradigm for relations between Ukraine and Israel today. Regardless of which side they were on in the war, radical Jewish nationalism today shares a common, ethnic view of nationalism with radical Ukrainian nationalists (and with the radical nationalists in power in Hungary, with whom Netanyahu has good relations despite their use of antisemitic imagery and veneration of their pro-Nazi forbears). Regardless of where they stood in WW2, radical Ukrainian, Hungarian and Jewish nationalists share common ground now (not really surprising, as Zionism is essentially a central European blood and soil nationalism transplanted to Palestine). So it's not inconsistent if Trump gives support to both.