Mainly it’s Russia’s influencing efforts. Many Western right-wing politicians are in their pockets, their money supports many hard-right parties, and their propaganda directly influences and pushes voters to these parties. So primarily it’s a practical relationship of aligned goals, as Russia’s global activity helps them get more power domestically, so they are more lenient with Russia’s fuckery in e.g. Ukraine.
Secondarily there is a sympathy, as Putin did many things they would like to do domestically, building a white Christian anti-LGBT nation with a strong hand (at least in perception). I also once read an article I couldn’t find now, that explained how in global Christian “church politics”, Russia managed to get very close to and influence US Christian leaders, so that might also have an impact.