WARSAW, Poland (AP) — U.S. Secretary of State John Kerry is vowing that a review into NSA surveillance activities will result in the "right" balance between security and privacy and says outrage over alleged espionage and eavesdropping should not disrupt key trade talks between Europe and the United States.

Speaking in Warsaw after talks with Poland's foreign minister, Kerry says Europeans and others have "legitimate" questions about the surveillance and that those would be answered in private diplomatic discussions.

But he says those discussions should be entirely separate from negotiations over a new transatlantic trade and investment deal.

Kerry is the most senior Obama administration official to visit Europe since revelations of NSA spying sparked major outrage across the continent.