WASHINGTON: Russia would cross "a red line for the United States of America" if it were to base nuclear capable bombers in Cuba, a top US air force officer warned on Tuesday.

"If they did I think we should stand strong and indicate that is something that crosses a threshold, crosses a red line for the United States of America," said General Norton Schwartz, nominated to be the air force's chief of staff.

He was referring to a report in a newspaper that said the Russian military is thinking of flying long-range bombers to Cuba on a regular basis in response to US plans to install missile defenses in eastern Europe.

A White House spokeswoman declined to comment on the report because there had been no "official response from the Russian government."

Are we reliving the cuban missile crisis?