Crude rebounded on Tuesday, lifted by renewed geopolitical concerns and in advance of closely-watched U.S. oil inventory data.

A day after prospects for a resumption of Libyan supply prompted its biggest daily fall in nearly a month. Hopes for a relaxation of sanctions on Iran later this year, enabling the Islamic Republic to sell more oil, were dampened after the United States targeted companies from China and Dubai for allegedly helping Tehran evade weapons and oil sanctions. That sent a signal that Washington will keep pressure on Iran over its nuclear program.