VLADIVOSTOK, Russia — The Obama administration on Friday declared the insurgent Haqqani network a terrorist body, a move that could undermine Afghan peace efforts and test fragile U.S.-Pakistani relations.

Secretary of State Hillary Rodham Clinton said she notified Congress of her decision, which bans Americans from doing any business with members of the Pakistan-based militant group and blocks any assets it holds in the United States.

"We also continue our robust campaign of diplomatic, military, and intelligence pressure on the network, demonstrating the United States' resolve to degrade the organization's ability to execute violent attacks," she said in a statement.