WASHINGTON, May 2 - The U.S. is sending Ukraine about $300 million in additional military aid, including an enormous amount of artillery rounds, howitzers, air-to-ground rockets and ammunition as the launch of a spring offensive against Russian forces approaches, U.S. officials said Tuesday.

The new package includes Hydra-70 rockets, which are unguided rockets that are fired from aircraft, The Associated Press reported. It also includes an undisclosed number of rockets for the High Mobility Artillery Rocket Systems, or HIMARS, mortars, howitzer rounds, missiles and Carl Gustaf anti—tank rifles. The weapons will all be pulled from Pentagon stocks, so they can go quickly to the front lines. The officials spoke on condition of anonymity because the aid has not yet been formally announced.