By Elizabeth Dilts Marshall NEW YORK (Reuters) – Oil and other commodities prices soared while global shares tanked on Monday as the United States said it was willing to ban Russian oil imports, stoking investor fears over inflation and slowing economic growth. Brent, the international benchmark, briefly hit more than $139 a barrel, its highest level since 2008. Nickel prices rocketed 90%, gold broke through $2,000 an ounce and wheat jumped to a 14-year high, as industrial buyers and traders scrambled amid supply disruptions linked to Russia’s invasion of Ukraine. Euro zone real government bon…