By Olesya Astakhova and Dmitry Zhdannikov

LONDON/MOSCOW (Reuters) -OPEC+ is set to agree to further raise oil output on Sunday while probably slowing the pace of increases from October compared with recent months because of weakening global demand, OPEC+ sources said.

OPEC+ has reversed its strategy of output cuts from April and has already raised quotas by about 2.5 million barrels per day, equating to about 2.4% of world demand, to boost market share amid pressure from U.S. President Donald Trump to lower oil prices.

But those increases have failed to significantly dent oil prices, which are trading near $66 a barrel supported by Western sanctions on Russia and Iran, encouraging further oil production increases by rivals such as the United States.

A Sunday deal to boost output from O

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