BRUSSELS, Dec. 18 - The European Union's foreign policy chief urged President Vladimir Putin to adopt a "radical change in attitude" and begin cooperating as EU leaders gathered to map out a long-term strategy for dealing with an economically wounded Russia, Reuters reported.

Federica Mogherini said the financial crisis hitting Moscow as a result of falling oil prices and Western sanctions was "not good news" and was adding to dangerous global instability. She spoke as she arrived on Thursday at an EU summit in Brussels.