Republican presidential nominee Donald Trump has raised fresh questions about his commitment to automatically defend NATO allies if they were attacked, a stance in keeping with his "America First" agenda, The New York Times reported.

In response to a question about potential Russian aggression toward the Baltic states, Trump told the newspaper in an interview that if Moscow attacked them, he would decide whether to come to their aid only after reviewing whether those nations "have fulfilled their obligations to us".

He added: "If they fulfill their obligations to us, the answer is yes."