The oil scenario markets have feared is here, and it risks derailing the stock market's bull run, according to a longtime strategist. In a note to clients on Monday, Ed Yardeni, president of Yardeni Research, pointed to the  spike in oil prices  driven by the war in Iran. He said he believes there is now a higher risk of a stock market "meltdown," a scenario he's previously described as similar to the market crash of the early 2000s. The sharp rise in crude has also raised the risk of