UNITED NATIONS — Venezuela’s foreign minister said Thursday that a new coalition of nations would fight what he called an illicit, American-led effort to topple his government, and he accused the United States of using sanctions and emergency aid as political weapons against Venezuelans.

“We all have the right to live without the threat of use of force and without application of illegal, coercive unilateral measures,” the foreign minister, Jorge Arreaza, told reporters at the United Nations’ headquarters in New York.

He described American-led actions as violations of United Nations Charter provisions that forbid threats or interference in a member’s internal affairs.

“We are an important group of countries who are sure that the majority of the members of this organization share the same interests,” Mr. Arreaza said, reading a statement outside the Security Council chambers.