A bitter Russo-German dispute over the ownership of a looted Rubens masterpiece has escalated dramatically after the Russian authorities ruled it should not be returned to Germany. The painting, Peter Paul Rubens' Tarquin and Lucretia, was "appropriated" from Germany at the end of World War II by a Red Army soldier and is worth an estimated Ј50m. Its owners have included Frederick the Great, Joseph Goebbels' lover, a Red Army soldier and finally, and most controversially, Moscow real estate tycoon Vladimir Logvinenko.