 Exchange-traded funds focused on oil and gas dropped Monday, as investors weighed a price cap on Russian oil as well as economic data prompting concerns that the Federal Reserve may need to keep up its aggressive monetary tightening for longer. Shares of the SPDR SP Oil Gas Exploration Production ETF XOP, -4.64 closed about 4.6 lower Monday, while the United States Oil Fund LP USO, -3.04 finished down around 3 and the United States Natural Gas Fund UNG, -10.38 tanked about 10.4, according to data from FactSet. 