SINGAPORE (Reuters) - Brent crude oil prices rose to $70 a barrel on Monday, supported by ongoing output cuts led by OPEC and Russia, and ignoring a rise in U.S. and Canadian drilling activity that points to higher future output in North America. Brent crude futures LCOc1, the international benchmark for oil prices, were at $70 per barrel at 0558 GMT, up 13 cents from their last close. U.S. West Texas Intermediate (WTI) crude futures CLc1 were at $64.53 a barrel, up 23 cents.