GLOBAL MARKETS-Brent oil over $125; S&P 500 ends at 4-year high

NEW YORK, Feb 24 (Reuters) - Brent oil rose above $125 a barrel to end near a 10-month high on Friday as the United Nations' nuclear watchdog said Iran has sharply stepped up work on uranium enrichment, while the S&P 500 closed at the highest level since June 2008.