GLOBAL MARKETS-Europe subdued, Russia shares tumble on new sanctions

* Russia stocks tumble anew after new sanctions, on legal issues * China stocks gain after jump in industrial firm profits * Dollar index hovers near 6-mth highs as euro sags * This week's U.S. data eyed for directional cues By Marc Jones LONDON, July 28 (Reuters) - The euro was stuck near its lowest level since November and Russian shares tumbled for a third straight day on Monday as new European sanctions for Moscow chilled the already frosty relationship between the two.