YOU SAID:

japan is so small they don't even matter

INTO JAPANESE

日本はとても小さいので、関係ない

BACK INTO ENGLISH

Japan is so small that it does not matter

INTO JAPANESE

日本はとても小さいので問題ありません

BACK INTO ENGLISH

Japan is so small that there is no problem

INTO JAPANESE

日本はとても小さいので問題ない

BACK INTO ENGLISH

Japan is so small that there is no problem