LAGOS, Nigeria (AP) — The U.S. has dispatched a small team of military officers to Nigeria, the general in charge of U.S. Africa Command told reporters in a briefing on Tuesday.

General Dagvin R.M. Anderson said the move followed his meeting with Nigeria’s president, Bola Tinubu, in Rome late last year.

“That has led to increased collaboration between our nations, to include a small U.S. team that brings some unique capabilities from the United States in order to augment what Nigeria has been doing for several years,” Anderson said.

It is unclear when the team arrived in Nigeria.

The military officers are the latest step since the U.S launched airstrikes against a group affiliated with the Islamic State last year on Dec. 25.

Nigeria has been in the diplomatic crosshairs of the U.S. following threats by U.S. President Donald Trump to attack the country, alleging the West African nation is not doing enough to protect its Christian citizens. Following the allegations, the West African country was designated as a Country of Particular Concern, a congressional designation in the U.S. for countries responsible for religious oppression.

The Nigerian government firmly rejected the claim of Christian genocide, saying the armed groups target people regardless of their faith.

The diplomatic dispute has led to increased military cooperation between the two countries. The terms of the cooperation have been unclear. The U.S has supplied Nigeria with military equipment and carried out reconnaissance missions across Nigeria.

Nigeria has been battling several armed groups across the country. The groups include Islamist sects like Boko Haram and Islamic State West Africa Province.

Last month, an armed group launched simultaneous attacks on three churches in northwestern Kaduna state abducting 168 people.

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