Kathleen Fitzgibbons, the new US Ambassador to Niger, has arrived in the capital, Niamey, but will not formally present her credentials due to the "current political crisis," the US State Department announced on Saturday.
Fitzgibbons' arrival in Niger "does not reflect a change in our policy position but responds to the need for senior leadership of our mission at a challenging time," State Department spokesman Matthew Miller said.
The United States has been pressing for a diplomatic resolution to the crisis that erupted on July 26 when Niger military officers seized power, deposed President Mohamed Bazoum and placed him under house arrest.
Fitzgibbons' "diplomatic focus will be to advocate for a diplomatic solution that preserves the constitutional order in Niger and for the immediate release of President Bazoum and his family, and all those unlawfully detained," said Miller.
West Africa's main regional bloc on Friday said it had agreed to an undisclosed "D-Day" for a possible military intervention to restore democracy in Niger if diplomatic efforts fail.
Fitzgibbons is a career diplomat who was confirmed in the post by the US Senate in July, nearly a year after she was nominated.
The US and Iran failed to reach an agreement to end their war despite marathon talks that concluded on Sunday in the Pakistani capital Islamabad, jeopardising a fragile ceasefire.
Russia and Ukraine accused each other on Sunday of breaching the 32-hour ceasefire in their four-year war, reporting more than a thousand drone and shelling attacks just hours after the truce began on Saturday to mark Orthodox Easter.
At least 30 people were killed on Saturday in a stampede at the Laferriere Citadel in the northern countryside of Haiti, authorities said, warning that the death toll could rise.
A cyclone battered New Zealand's North Island on Sunday, cutting power to thousands of residents and forcing hundreds to evacuate, as officials warned conditions would worsen through the day.
Negotiations between the United States and Iran appeared to have concluded for now, Iran's government has announced early on Sunday, after a series of talks in Pakistan to end the six-week war between Washington and Tehran.