By Stephanie Kelly NEW YORK (Reuters) -Oil jumped about 2% on Monday, with investors worried about tighter supply as mounting civilian deaths in Ukraine increased pressure on European countries to impose sanctions on Russia’s energy sector. Global benchmark Brent crude was up $1.94, or 1.9%, to $106.33 a barrel by 1:10 p.m. EDT (1710 GMT). U.S. West Texas Intermediate crude rose $2.50, or 2.5%, to $101.77 a barrel. Trading was volatile with both contracts gaining more than $4 earlier, after being down more than $1. German Chancellor Olaf Scholz said Russian President Vladimir Putin and his sup…