Explosions rang out on a Wednesday morning in central Kyiv as Russia ramps up its drone and missile attacks on the city's power and heating infrastructure, taking advantage of the freezing temperature outside in an attempt to break Ukrainians' morale.

KYIV, Ukraine (AP) — Russia launched a second major drone and missile bombardment of Ukraine in four days, officials said Tuesday, aiming again at the power grid amid freezing temperatures in an apparent snub to U.S.-led peace efforts as Moscow’s invasion of its neighbor approaches the four-year mark.