(Reuters) – Firefighters searched the rubble of a Ukrainian shopping mall where authorities said 36 people were missing after a Russian missile strike that killed at least 18, as a regional governor reported another “enemy attack” further east. Russia denied hitting the mall, saying it had struck a weapons depot and a subsequent explosion of ammunition had triggered a fire in the nearby complex. The Group of Seven rich democracies called the strike a Russian war crime. ECONOMY AND DIPLOMACY * The Group of Seven economic powers agreed to explore imposing a ban on transporting Russian oil that h…