According to Mr. Cummings’s letter, the company came under United Nations scrutiny after allegations of bribery surfaced involving two Russian officials serving at the United Nations. As part of that investigation, the United Nations removed the company in 2007 from its approved list of vendors, the letter said.



In October 2015, Mr. Flynn was paid another $11,250 by the firm, Kaspersky Government Security Solutions, which was founded by Eugene Kaspersky. Mr. Kaspersky’s Moscow-based Kaspersky Lab has long been suspected of having ties to Russian intelligence services. He studied cryptography at a high school run by the K.G.B. and Soviet Defense Ministry, and later worked for the Russian military.

Mr. Kaspersky founded the lab with his wife in their Moscow apartment in 1997, and since then, it has grown into one of the most well-known and respected cybersecurity firms in the world. That prominence would make interactions with Russian intelligence unavoidable, although no concrete evidence has yet to surface showing any formal cooperation, experts and current and former American officials said.

Kaspersky Lab said in a statement that Mr. Flynn was paid a fee for remarks he delivered at a 2015 cybersecurity forum in Washington.