Defense stocks L3Harris Technologies Inc LHX.N, Northrop Grumman Corp NOC.N and Lockheed Martin Corp LMT.N gained more than 1% each. By Devik Jain and Sabahatjahan Contractor March 7 (Reuters) - U.S. stocks were set to open lower on Monday as the prospect of a ban on oil imports from Russia pushed Brent above $130 a barrel and added to concerns over spiraling inflation and slowing economic growth. Wall Street ended lower on Friday as the war in Ukraine overshadowed an acceleration in U.S. jobs growth last month that pointed to strength in the economy.