Mr. Kyaw Zeya’s comments on Friday appeared to show just how intent Myanmar is to prevent the three members of the United Nations mission — who are from Australia, India and Sri Lanka — from setting foot in the country.

U Khin Zaw Win, the director of the Tampadipa Institute, a policy think tank that urged Myanmar to cooperate with the United Nations-backed mission, said that the government’s position was a “very unseemly and unsightly about-face” for Ms. Aung San Suu Kyi. Her government came to power last year, and she had long relied on the United Nations for support during her years under house arrest.

Under military rule, “all of us were fighting for democracy and rights and freedom,” said Mr. Khin Zaw Win, who was jailed for 11 years, often alongside activists who are now officials in Ms. Aung San Suu Kyi’s party, the National League for Democracy. “But now that the N.L.D. has won handsomely — and they’ve won because of the votes of the people — it’s turning its back on those very values.”

Ms. Aung San Suu Kyi helped form a commission in August to study conditions in Rakhine. The commission is led by Kofi Annan, a former United Nations secretary general, and includes six experts from Myanmar and three from overseas, including Mr. Annan. It is expected to make recommendations to the government this year about how to alleviate poverty and ethnic strife in the state.

Ms. Aung San Suu Kyi has not traveled to Rakhine State since violence erupted there in October, though, and few experts expect the commission or the government’s separate investigation of recent violence to have much of an impact.

Some analysts have speculated that Ms. Aung San Suu Kyi is reluctant to engage more forcefully in the state for fear that doing so could antagonize Myanmar’s small but vocal fringe of hard-line Buddhist nationalists. Others say that her hands are effectively tied because the military-drafted Constitution grants the armed forces wide powers over domestic security.

But Mr. Khin Zaw Win said that he believed Ms. Aung San Suu Kyi’s primary concern was that the United Nations mission would embarrass her government by concluding that it had mishandled the situation in Rakhine.