It doesn't. NATO is an acronym for North Atlantic Treaty Organization. OTAN is an acronym for the French translation of that - Organisation du Traité de l'Atlantique Nord.
If you are able to please consider donating to the Disasters Emergency Committee to help the people of Ukraine. The DEC pools the resources of 15 leading UK humanitarian relief charities to raise funds quickly for overseas disasters and get aid to the people who need it. This article explains why it's important to donate money rather than supplies, and to give to reputable charities.