The two countries were 'neutrals' while their neighbors were at war.
“Why did you do that?” he asked in a 'neutral' tone of voice.
He 'remained/stayed neutral' while his brothers argued.
(..) Now nothing's gonna taste right. - Lower your weapon. - No. Jay, how are you, boo-boo? - These guys really need Kay. - He's a neutral. - Tell me something we don't know. - Yeah, tell me something... I am so sorry. - God bless you. - Thank you. (..)2002 Men in Black II
(..) - The metre's running, Jeebs. Do you remember me? Can't say I do. I'm good with faces. I think I'd remember that. The great Kay's a neutral. You're between me and my memories. Do you have this deneuralyzer or not? No. Fresh out. Can't help you. (..)2002 Men in Black II