There has been a “substantive” change in the type of weaponry the US and its allies are providing to Ukraine to meet Kyiv’s requests for firepower, two senior US officials tells CNN. The US’s latest aid announcement included more offensive weapons, such as Bradley Fighting Vehicles and advanced long-range rocket systems, reflecting the nature of the battlefield in Eastern Ukraine and a belief that Ukraine sees a window to regain territory before Russia regroups, one of the officials said, describing the new weapons systems as giving the Ukrainians “much more capability.” One US official also noted that Ukraine has abided...