US warns Putin of 'catastrophic' consequences if nuclear weapons used in Ukraine
"This is not a bluff," Putin said in the remarks viewed on the world stage as a threat on the potential use of nuclear weapons.
US national security adviser Jake Sullivan speaks to reporters during a press briefing at the White House in Washington, US, July 11, 2022.(photo credit: REUTERS/KEVIN LAMARQUE/FILE PHOTO)ByREUTERS
