The West African country has been blighted by thousands of spills in recent years.
Nigeria slipped into recession in 2016 after militants blew up oil facilities. But the government is trying to negotiate peace.
Ethnic tensions are boiling over in Nigeria. They did that before, and more than 1 million people died as a result.
Norway sold seven decommissioned warships to a militant leader in Nigeria's oil basin, and the U.K. facilitated the sale.
While a fragile truce is allowing Nigeria to step up oil output, a resolution of the crisis is unlikely without further concessions.
The Niger Delta Avengers and other groups have blown up oil pipelines throughout the year.
Militants have decimated oil production in the Niger Delta.
Militancy in the Niger Delta has slashed oil production by over 400,000 barrels per day.
The group has cut Nigeria's oil production by hundreds of thousands of barrels.
Economics, not ideology, is the driving force behind Nigeria's Islamist insurgency.
Community groups are demanding better employment opportunities in the oil-rich region.
The ex-president said militants in the Delta want him dead.
Nigeria's oil production has been hammered by militant attacks.
The president said his government is talking to militants, but the Niger Delta Avengers disagree.
Kachikwu just got demoted but is still one of Nigeria's key figures.
The group had not claimed any attacks since June 16.
"I fail to appreciate the economic explanation," said the Nigerian president.
The militant group, based in Nigeria's oil hub, have previously threatened to secede from the country.
The NDA has decimated Nigeria's oil production and is threatening to take lives.
The Niger Delta Avengers are continuing to blow up oil pipelines.
"Don't wait until we go the way of Sudan," the militant group warned.
The group have continued to attack pipelines in the region, cutting oil production by 600,000 barrels per day.