"These measures involve a greater police presence and more detailed passenger checks," an interior ministry spokesman said.
Interior Minister Vladimir Kolokoltsev said in October that the number of terrorist attacks in the country had halved since 2011, though he gave no actual figures on the issue, RIA Novosti news agency reported.
"We're observing a downward trend in crimes of terrorist nature in the last three years. The number of terror attacks has decreased by half," he said.
Female suicide bombers are often referred to in Russia as "black widows" - women who seek to avenge the deaths of their family members in North Caucasus fighting by targeting Russian civilians.
Female suicide bombers set off blasts at two Moscow subway stations in March 2010 that killed more than 35 people.
So-called black widows were also responsible for killing more than 90 people when they took down two passenger jets that took off from a Moscow airport within minutes of each other in 2004.
About the broadcaster:
Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.
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