Neighboring Country
noun
A neighbor country is a neighboring country. For us, our 隣国 in America are those sneaky Canadians... always waiting to strike, I can tell...
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Watch out for the rendaku.
どうして隣国の肩を持つのさ？日本人じゃないの？
Why are you taking sides with the neighboring country? Aren’t you Japanese?