Foreign Ministry spokesman Alexander Lukashevich said Russia was unsatisfied with the U.S. because they were not informed about the arrest of Russian citizens, among others, accused of illegally exporting military technologies, reports Interfax.

"Some serious questions have been raised because U.S. authorities did not properly notify the Russian consulate of the arrest of our fellow citizens," said Lukashevich.

Russian Foreign Minister Sergey Lavrov, however, said that the Foreign Ministry is still checking whether there are any Russians among thsee detained.

"The Americans told us that 13 people were arrested. Ten of them are the citizens of the U.S., and the rest are the citizens of former socialist countries," RIA Novosti quotes Lavrov as saying.

Earlier it was reported that the main suspect in the arrests was 46-year-old naturalized U.S. citizen Alexander Fishenko, who is head of the American company Arc Electronics and is registered in Moscow as Apex System, and has both U.S. and Russian citizenship.

Minister Lavrov also said that the arrest of the "spies" was not related to the election campaign in the U.S.

"I do not see any connection between this issue and the election race," said Lavrov.

The head of the Duma Committee for Security and Anti-Corruption, Irina Spring, had earlier said that the "spy scandal" in the U.S., in her opinion, is being played out against the backdrop of the election campaign.

"The United States in now the middle of an election campaign, during which, as always, the mandatory top of "love" for Russia is played out," she said.

Fishenko, along with seven other people, was arrested in Houston on Wednesday morning. Three other suspects in the case, according to prosecutors in Brooklyn, are currently in hiding in Russia. They are are charged with the illegal export of microchips that are allegedly being sent to Russian military and intelligence services.

Earlier on Thursday, Deputy Foreign Minister Sergei Ryabkov said that the charges against the Russian suspects are criminal in nature and are not related to intelligence.