odd one out

The Japan Times Online January 31のOpinion面の記事、Russia’s East-West dilemmasからの引用です。
It's in no nation's interest that Russia should continue to be the odd one out. The contemporary world is changing shape and has to be managed in new ways. If Russia wants to play a strong part in the rise of Eurasia and the connectivity of the globe, it will have to change its direction and decide how to become a good ally, not a spoiler, of both the East and West.
上記は、ロシアは西洋の国か東洋の国か？と冒頭で投げ掛けた論説の最後の段落を引用しました。
"odd one out" の意味を調べます。
・Cambridge English Dictionary: a person or thing that is different from or kept apart from others that form a group or set: She was always the odd one out at school - she didn't have many friends.
・Farlex Dictionary of Idioms: Someone who is excluded from or left out of a group for some reason. Ever since my injury, I've been odd one out when my friends go to play football together.
・Wiktionary: Something or someone in a group that is different or exceptional, that does not fit.