WASHINGTON (Reuters) - Former White House aide Lawrence Summers on Sunday urged Europe to take a more aggressive response to the debt crisis sweeping the region and suggested patience with its approach was running thin. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=C5Pe0iETanI:YBoJgX-Ek4M:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=C5Pe0iETanI:YBoJgX-Ek4M:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/C5Pe0iETanI)