LONDON—OPEC and its allies begin two days of meetings on Wednesday to decide whether to release more oil into the market or restrain supply amid an oil price rout and fears the Omicron coronavirus variant could weaken global energy demand. Oil prices fell to near $70 a barrel on Tuesday from as high as $86 in October, posting their biggest monthly decline since the outset of the pandemic, as the new variant raised fears of a supply glut. For November, Brent fell by 16.4 percent, while WTI fell 20.8 percent, the biggest monthly fall since March 2020. “The threat to oil demand is genuine,” said Louise Dickson, senior oil markets analyst at Rystad Energy. “Another wave of lockdowns could result in up to 3 million bpd (barrels per day) of oil demand lost in the first quarter of 2022.” Also pressuring prices, Federal Reserve Chair Jerome Powell said the U.S. …