` Today 's indiscriminate shelling of Mariupol ( is ) part of an apparently Russian-backed general offensive in complete violation of Minsk agreements , '' said U.S . U.S. Secretary of State John Kerry calls on Russia to end separatist violence . UN monitors said rockets were likely fired from pro - Russian rebel territory . Fighting between rebels and government forces has intensified in recent days .
U.S. Secretary of State John Kerry calls on Russia to end separatist violence . UN monitors said rockets were likely fired from pro - Russian rebel territory . Fighting between rebels and government forces has intensified in recent days .