UPDATE: in light of the voting on the answers below (+12 for "Nuke 'em" vs +3 for "Leave 'em"), these tags have been eliminated. french was already gone before I got to it, and I've just finished the few edits and merges needed to get rid of japan and russian.
The tag japan is used on 13 questions: some story-ID questions seeking a Japanese book or film, some questions about Japanese culture or folklore, and some questions about manga or Godzilla which are only tangentially related to Japan. The tag wiki and tag wiki excerpt are both merely descriptions of the country Japan, with no usage guidance for the tag.
The tag russian is used on 12 questions: some story-ID questions (again), some questions about the Russian language used in particular SFF works, and some genre-history questions. The tag wiki and tag wiki excerpt say:
Media created in Russia, using the Russian language or about Russian characters or historical people.
The tag french is used on 2 questions, both story-ID; there is no tag wiki or tag wiki excerpt.
I've checked various other countries and regions, but couldn't find any more tags like these.
What should be done with these tags?
Clearly, we don't want to stick, for instance, the russian tag on every question about every SFF work made in Russia or featuring Russian characters. That would involve hundreds and hundreds of largely pointless tag edits. So at the very least, tag wikis will have to be rewritten and more clear usage guidance laid out. But note also that if the tag exists, people will surely be tempted to use it for various different purposes, since the tag name alone doesn't make clear how it should be used. Because of this unclearness, I'm tempted to suggest deleting it altogether.
Plus there's inconsistency in the tag names - some use the country name, some the adjective - and also in which countries are represented. If Japan, Russia, and France merit their own tags, why don't other countries too? If not every country does, why have tags for just those three?