Obama, European leaders discuss Ukraine, global security

WASHINGTON/PARIS (Reuters) - U.S. President Barack Obama and European leaders held a video conference on Tuesday to discuss the Ukraine crisis, and France said all agreed that a "strong reaction" would be necessary if the ceasefire reached last month in Minsk was violated. The talk held at 11:30 a.m. EST (1630 GMT) between Obama and the leaders of Britain, France, Germany and Italy, as well as the head of the European Council, was also to cover global security issues, the White House s