This is the 150th most frequent Russian word.
нато
The Russian word "НАТО" refers to "NATO" in English, standing for the North Atlantic Treaty Organization.
In this context, 'НАТО' refers to the organization North Atlantic Treaty Organization.
НАТО является международной военной организацией.
NATO is an international military organization.
Here, 'нато' is a form of the word meaning 'pointless' or 'for no reason'; it expresses an action done without cause.
Он сказал мне, что нато лаять собаки, если опасности нет.
He told me that it's pointless for a dog to bark if there is no danger.
In this case, 'нато' is informal speech used colloquially to start a debate or initiate the subject matter in a discussion.