eaders of the Group of Seven (G7) nations on Tuesday condemned Russian leader Vladimir Putin’s nuclear rhetoric and Moscow’s latest missile attacks on Ukrainian cities.Leaders said they would hold Putin to account for the attacks, and that any use of chemical, biological or nuclear weapons would be met with severe consequences.The White House said US President Joe Biden had spoken with Ukrainian President Volodymyr Zelenskyy and promised to send advanced air defense systems to Ukraine. Germany has also said it would deliver the first of four air defense systems.