The seemingly eased demands on Qatar made by the four Arab countries that have severed relations with it are an insincere “face-saving approach” to resolving the Persian Gulf crisis, Qatar’s United Nations ambassador said on Wednesday.

The ambassador, Alya Ahmed al-Thani, also said there could be no direct negotiations until her country’s antagonists ended their economic boycott of Qatar, which she described as an illegal “siege” causing deep harm.

The remarks by the ambassador in a telephone interview appeared to signal no hint of progress in the dispute, which erupted on June 5 and has bared bitter fractures among gulf Arab neighbors that share strong alliances with the United States.

Ms. Thani spoke a day after diplomats from the countries that broke relations with Qatar — Bahrain, Egypt, Saudi Arabia and the United Arab Emirates — indicated they were no longer insisting on compliance with 13 specific demands. Instead, the diplomats said, they have reframed their position as requesting Qatar’s adherence to six “principles.”