This is about the argument over some Northern Japanese islands which the Russian captured during the war. "You can kiss my ass" = I don't think you're important or strong enough to do anything to me. "Japasses" = "Japanese asses". The Russians can kiss Japasses all day long - which is true really. The Japanese have the money, and the Russians are third world. Just over 100 years ago, the Japanese had a famous military victory over Russia. Despite being considerably smaller, they kicked Russian ass. I imagine the Japanese couldn't care less about Russian chauvinism.

This is not a polite sentence and is not a good thing to say! The person who said it was insulting Russia (and also Japan in a way). The phrase 'kiss ass' means something like 'to win friendship by making insincere compliments'. The sentence, therefore, means 'Russia is making insincere compliments about Japan in order to win friendship or favourable business contracts' In my view this has nothing to do with the samurai spirit. I hope this helps explain your question. Stephen

It means that the speaker was not very analytical, and favored Japanese over Russians.

Sounds like some Russian guy liked Japanese girls and Samurai men. :P