by Dmitry ZAKS and Dave CLARK, with Frankie TAGGART in Washington Agence France Presse KYIV, Ukraine (AFP) — The United States led a Western assault on Moscow’s economic lifeline Tuesday, banning imports of Russian oil as civilians fled besieged Ukrainian cities in a desperate evacuation push blighted by Russian shelling. President Joe Biden heralded the US embargo as a hit on “the main artery of Russia’s economy” targeting President Vladimir Putin’s most crucial source […]