The joint strategy should cover development aid, financial support and security cooperation, the letter was cited as saying by the newspaper.
Currently, the bloc lacks unity on the issue, since after the coup in Niger, some of the EU member states have called off their economic and developmental assistance to the country, while others have announced the continuation of some financial flows to Niger, and still others have not yet announced any decisions, Borrell said in the letter.
At the same time, the European Union believes that an international response to the recent events in Niger should be led by the Economic Community of West African States (ECOWAS), the media reported.
A coup took place in Niger on July 26. Nigerien President Mohamed Bazoum was ousted and detained by his own guard, led by Gen. Abdourahmane Tchiani. The caretaker National Council for the Safeguard of the Homeland closed the country's borders, ignoring security agreements with France, its former colonizer.
ECOWAS gave the coup leaders one week to reinstate Bazoum and restore order, hinting that it would resort to military intervention otherwise. Its ultimatum expired this past Sunday. Mali and Burkina Faso, also ECOWAS members, have rejected the intervention scenario in Niger, a sign of discord in the ranks of what is generally considered a pro-French regional alliance.