By Stephanie Kelly NEW YORK (Reuters) -Oil prices tumbled about 7% on Monday after China’s financial hub of Shanghai launched a lockdown to curb a surge in COVID-19 infections, prompting renewed fears of demand destruction. Brent crude futures fell $8.17, or 6.8%, to settle at $112.48 a barrel. U.S. West Texas Intermediate (WTI) crude futures fell $7.94, or about 7%, to settle at $105.96 a barrel. Crude futures have been volatile since Russia’s invasion of Ukraine in late February. Last week, Brent gained nearly 12%, while WTI rose almost 9%. Shanghai has entered a two-stage lockdown of 26 mil…