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“It seems incongruous for the administration to pursue a cooperative missile-defense agreement if, at pretty high levels, the GRU and their government is authorizing the bombing of our embassy,” he said.

Mr. Kyl said he could not discuss any intelligence matters involving the Sept. 22 incident.

“I cannot tell you whether I have been briefed by our side and, if so, what I might have been told,” he said, referring to the U.S. intelligence community.

A spokesman for the National Security Council and a spokeswoman for the CIA declined to comment for this report because it touches on intelligence issues.

Mr. Kyl is one of five senators who signed a letter released Tuesday to Secretary of State Hillary Rodham Clinton, National Security Adviser Tom Donilon and Director of National Intelligence James R. Clapper asking for briefings by the intelligence community and the State Department on the Sept. 22 incident.

The senators quote Mr. Utiashvili’s allegations from The Times‘ July 22 report.

“Given the seriousness of this accusation, we write to request a briefing from the intelligence community, the State Department and the National Security Council staff about the recent terrorist attacks in Georgia, including the blast near the U.S. Embassy, and their assessment of what, if any, linkages have been identified between the individuals responsible for these attacks and the Russian government,” the senators wrote.

In addition to Mr. Kyl, Sens. Lindsey Graham, South Carolina Republican; Mark Kirk, Illinois Republican; Joe Lieberman, Connecticut independent; and John McCain, Arizona Republican, signed the letter.

A Republican Senate staffer said that, before Mr. Utiashvili gave his interview to The Times, the back-and-forth with the administration over the incident was not public because so much of the information is classified.

A Georgian court already has sentenced Maj. Borisov in absentia for his purported role in the bombings. U.S. and Georgian officials say Maj. Borisov is still in the breakaway province of Abkhazia.

The allegations of Russian foul play against Americans are not new. A Jan. 30, 2009, cable from U.S. Ambassador John Beyrle first disclosed by the anti-secrecy website WikiLeaks accuses Russia’s Federal Security Service of waging an intimidation campaign against an official at the National Democratic Institute.