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 are continuing to blow up oil pipelines.
Pirates are ramping up their activities off Nigeria's southern coast, according to a report.
Power outages and long queues for fuel have been seen as militants sabotage oil pipelines.
The former Niger Delta kingpin has been on the run since January.
After Boko Haram in the northeast, a number of threats are destabilizing Nigeria's south.
A Nigerian court ordered the arrest of an ex-militant kingpin, prompting a spate of attacks on oil pipelines.
The ex-Niger Delta militant leader is accused of involvement in $175 million worth of corruption.