WASHINGTON — The U.S. will send Ukraine an undisclosed number of medium-range cluster bombs and an array of rockets, artillery and armored vehicles in a military aid package totaling about $375 million, U.S. officials said Tuesday.

Officials expect an announcement on Wednesday, as global leaders meet at the U.N. General Assembly, and Ukrainian President Volodymyr Zelenskyy uses his appearance there to shore up support and persuade the U.S. to allow his troops to use long-range weapon s to strike deeper into Russia. The following day, Zelenskyy meets with President Joe Biden and Vice President Kamala Harris in Washington.