MAIDUGURI, Nigeria, Jan 20 (Reuters) - Islamist militants attacked a facility housing several aid groups in northeast Nigeria at the weekend in what the United Nations warned on Monday is an escalation in violence specifically targeting aid workers.

BRUSSELS, Jan 20 (Reuters) - European Union foreign ministers agreed on Monday to look at ways to support a formal ceasefire in Libya if warring sides can move beyond a tentative truce, including a monitoring mission and reviving a naval operation to uphold a U.N. arms embargo.

DUBAI, Jan 20 (Reuters) - Iran considers the passengers with dual nationality, who were on a Ukrainian plane that was shot down accidentally earlier this month, killing all on board, to be Iranian citizens, a Foreign Ministry spokesman said on Monday.

TEGUCIGALPA, Jan 20 (Reuters) - The Honduran government has formally declared Iranian-backed Lebanese group Hezbollah a terrorist organization, the country's deputy security minister said on Monday. (Reporting by Gustavo Palencia; Editing by David Alire Garcia and Diane Craft)

BRUSSELS (Reuters) - Venezuelan opposition leader Juan Guaido will come to Brussels on Wednesday to hold talks with the European Union's foreign policy chief Josep Borrell, Borrell told a news conference.

BRUSSELS, Jan 20 (Reuters) - Venezuelan opposition leader Juan Guaido will come to Brussels on Wednesday to hold talks with the European Union's foreign policy chief Josep Borrell, Borrell told a news conference.

Jan 20 (Reuters) - Iran said it could quit the global nuclear Non-Proliferation Treaty (NPT) if European countries refer it to the U.N. Security Council for scaling back its commitments under its 2015 nuclear pact with world powers, which the United States quit in 2018.

DUBAI (Reuters) - Iran said on Monday it could quit the global nuclear Non-Proliferation Treaty (NPT) if European countries refer it to the U.N. Security Council over a nuclear agreement, a move that would overturn diplomacy in its confrontation with the West.

LONDON (Reuters) - Oil prices rose to their highest in more than week on Monday after two large crude production bases in Libya began shutting down amid a military blockade, risking reducing crude flows from the OPEC member to a trickle.