WASHINGTON — The Obama administration insisted Friday that “there is time and space” for a diplomatic solution to the Iranian nuclear crisis, despite new evidence, to be released next week by international nuclear inspectors, that Iran is bolstering its ability to produce a type of uranium that can be converted relatively quickly to bomb fuel.

In a statement that was notable chiefly for the fact that it was issued before the International Atomic Energy Agency’s report is scheduled to be made public, a White House spokesman, Tommy Vietor, said Iran “is continuing to violate its international obligations” despite the imposition of sanctions that severely restrict the country’s oil revenue.

The energy agency’s inspectors found that Iran had installed hundreds of new centrifuges in the deep underground site called Fordow in recent months, but Mr. Vietor said that did not change the White House assessment that diplomatic solutions to the Iranian nuclear issue were still viable.

The White House statement appeared intended to pre-empt statements from Israeli officials, who are citing the forthcoming inspectors’ report to bolster their argument that the negotiations with Iran have simply allowed Tehran to speed ahead with its construction program, and that sanctions have been ineffective.

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The office of Prime Minister Benjamin Netanyahu reported Friday that during a meeting with Representative Mike Rogers, a Michigan Republican who heads the intelligence committee, Mr. Netanyahu said, “Just yesterday, we received additional proof of the fact that Iran is continuing to make accelerated progress toward achieving nuclear weapons while totally ignoring international demands.” He appeared to be referring to news accounts about the inspectors’ report.

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Iran’s top negotiator was in Vienna at the International Atomic Energy Agency’s headquarters in an effort to work out an agreement for Iran to allow inspectors to visit a site, called Parchin, where inspectors believe weapons work may have been conducted. But the effort failed, along with parallel efforts to get Iran to answer a series of questions about suspected weapons-related experiments that the country has refused to discuss for several years.