FWIW, the US has received and accepted offers of assistance from all over the world, including a full-scale effort by the United Nations.
http://tvnz.co.nz/view/page/411749/608786 Even Fidel Castro has offered medical assistance! Which is as it should be- humanitarian disasters are not opportunities to make political mileage or settle scores.
http://www.moscowtimes.ru/stories/2005/09/05/011.html
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
