Elmau Castle, Germany and Kyiv, Ukraine — Senior Biden administration officials have confirmed to CBS News that the White House is planning to announce this week the purchase of an advanced medium- to long-range surface-to-air missile defense system for Ukraine. CBS News correspondent Ed O'Keefe said Washington was expected to promise more artillery shells and radar systems, too, as it tries to meet the urgent requests coming from Ukraine's leaders. 

Mr. Biden and his fellow G7 leaders, meeting Monday in Germany, were likely to hear a fresh appeal from Ukrainian President Volodymr Zelenskyy, who was to address them virtually from Kyiv. He told his own country on Sunday night, in a daily video address, that Ukraine needed military, financial and humanitarian assistance immediately to fight back against Russia's invasion.

As CBS News correspondent Ramy Inocencio reports from the Ukrainian capital, Russia shattered weeks of relative calm in Kyiv by firing a volley of long-range missiles at the city early Sunday morning. It was an apparent show-of-force by the Kremlin as the Western leaders gathered in Germany to strengthen their military and economic support for Ukraine.

Kyiv Mayor Vitali Klitschko said the Russian missiles hit at least two residential buildings, and Zelenskyy said in his Sunday night address that a 37-year-old man was killed and his 7-year-old daughter and wife — a Russian national — were injured.