The early warning radars on Greenland are key to defending the U.S. against nuclear attack, but they're vulnerable to hypersonic missiles, critics warn.
The launch happened hours after South Korean and U.S. troops kicked off their large annual combined drills, which the North views as an invasion rehearsal.
Adm. Samuel Paparo cautioned military aid for the countries could hamper America's ability to respond to China should a conflict arise in the Indo-Pacific.
The Biden administration will send Ukraine an undisclosed number of medium-range cluster bombs and an array of rockets, artillery and armored vehicles.