PROVIDENCE, R.I., May 26 (UPI) -- Sergei Khruschev, the son of former Soviet leader Nikita Khruschev, and his wife are to become U.S. citizens next month. Khruschev, 63, who works at Brown University in Rhode Island, and his wife, Valentina Golenko, are to be granted citizenship on June 23. Khruschev, a rocket engineer and computer scientist, told reporters that he has been living in Rhode Island for seven years ``and I am planning to stay here.'' He said that if he lives in this country, ``I believe I should be a U.S. citizen rather than a foreigner who arrived to temporarily stay in the United States. According to his lawyer, Dan Danilov, the U.S. Immigration and Naturalization Service has approved their citizenships. Khruschev arrived in the United States in 1991 to lecture at Brown University, and applied for permanent residence a year later. It was granted in 1993. Danilov said Khruschev was worried about what his father might have said about his seeking U.S. citizenship, but he told him ``his father would never learn about it.'' Nikita Khruschev was Soviet premier in 1958 until he was ousted in 1964. He died in 1971. Sergei Khruschev said that living in the United States, he is frequently asked to explain his father's famous remark, ``We will bury you.'' He said that at the time his father was referring to a socialist centralized economic system, which he believed would prevail over a free market system. However, he said the ``unfortunate phrasing'' was misunderstood to mean a threat to the people of the United States. Khruschev has published several books, and his latest, ``Nikita Khruschev: Creation of a Superpower,'' is due to be released in October. He said, ``I think it will be my contribution to the citizenship.''  