By David Lawder NEW DELHI (Reuters) -The United States is happy for India to continue buying as much Russian oil as it wants, including at prices above a G7-imposed price cap mechanism, if it steers clear of Western insurance, finance and maritime services bound by the cap, U.S. Treasury Secretary Janet Yellen said on Friday. The cap would still drive global oil prices lower while curbing Russia’s revenues, Yellen said in an interview with Reuters on the sidelines of a conference on deepening U.S.-Indian economic ties. Russia will not be able to sell as much oil as it does now once the Europea…