“Our economic and security partnership with Niger, which is significant, hundreds of millions of dollars, depends on the continuation of the democratic governance and constitutional order that has been disrupted by the actions in the last few days,” Blinken told reporters at a news conference in Australia. “So, that assistance, that support is in clear jeopardy as a result of these actions, which is another reason why they need to be immediately reversed,” Blinken said. “We have communicated that as clearly as we possibly can to those responsible for disrupting the constitutional order and Nigerien democracy.”

The coup and its aftermath became a running challenge to his trip to the South Pacific, forcing Blinken to postpone some events so he could hold urgent talks with Bazoum, French officials and other leaders in the Sahel region. Blinken has remained in contact with Bazoum over the course of his detention, and the two men spoke to each other again Saturday, the State Department said.

West viewed Niger as democratic bulwark before the military coup

Blinken also spoke with former president Mahamadou Issoufou, whom U.S. officials are using as an intermediary with the coup plotters. But the Nigerien officers who have seized power have unclear demands, apart from simply wanting to control the country, making it difficult to negotiate with them, U.S. officials said. Tchiani said Friday the “harsh reality of insecurity in Niger” had led soldiers to overthrow the president.

Tchiani said the democratically elected government had not cooperated enough with neighboring Mali and Burkina Faso to combat the insurgency in the Sahel, adding that the new government would pursue closer ties to those countries, which also are under military rule. But France, which has roughly 1,500 troops deployed in Niger to battle the militants, announced Saturday it was halting development and budget aid to Niamey.

The French Foreign Ministry called for “an immediate return to constitutional order” in a statement. Niger is a former French colony and has served as the main ally for Paris in the fight against insurgents in the region. The European Union suspended financial support and all security cooperation with Niger, the top diplomat of the bloc, Josep Borrell, said in a statement Saturday. “This unacceptable attack on the integrity of Niger’s republican institutions will not remain without consequences,” he said.

On Friday, the African Union condemned the coup and gave the ruling junta 15 days to reinstate the democratically elected government. But the military has shown no sign of backing down. Brig. Gen. Mohamed Toumba told state television that coup leaders met with civil servants Friday and ordered them to “keep on with things” so the government was still running, the Associated Press reported. “Everything that must be done will be done,” Toumba said.

Parker reported from Washington. Ellen Francis in Munich contributed to this report.