* Putin says gays can feel at ease in Russia
* Says Russia will do everything to ensure security at Winter Olympics
* Wants Sochi games to boost Russians' self-esteem (Adds Putin on security, explosions in Makhachkala)
By Darya Korsunskaya
SOCHI, Russia, Jan 17 (Reuters) - Russia is not "going after" gays, President Vladimir Putin said on Friday, defending a ban on "propaganda" about homosexuality that has brought criticism from the West ahead of the Winter Olympics.
The Kremlin hopes the games, starting on Feb. 7 in the city of Sochi on the Black Sea, will showcase Russia's modern face more than two decades after the Soviet Union collapsed.
Putin has identified himself closely with the $50-billion event and also pledged Russia will do everything to ensure safe Games in spite of security concerns.
But Russia last year upset the West and human rights activists by banning what it called the promotion of homosexuality among minors. Calls for a mass boycott of the games have failed, but the row has clouded the build-up to the event.
Critics say the law is discriminatory and part of a rolling back of human rights and democratic freedoms under Putin, who has taken a more conservative course on social issues since returning to the presidency in mid-2012.
"There is no ban on non-traditional forms of sexual interaction between people. We have a ban on propaganda of homosexuality," Putin told a meeting with young volunteers preparing for the games.
"We ban nothing, we aren't going after anyone, we have no responsibility for such contacts."
Putin said some U.S. states had laws envisaging criminal responsibility for gay sexual intercourse.
"We have no such thing, people can feel free and at ease but please leave the children in peace," he said.
Putin did not elaborate. In a victory for gay rights activists, the U.S. Supreme Court in 2003 invalidated any remaining anti-sodomy laws that prohibited sex between adults of the same gender.
In a clear message to Moscow, U.S. President Barack Obama included three openly gay athletes in his Olympic delegation and Britain said it would sent to Sochi a minister responsible for the country's same-sex marriage laws.
Moscow has said it expects more than 6,000 athletes from 85 countries and hundreds of thousands of sports fans in Sochi.
It has also introduced a security clampdown in the city, bringing in about 37,000 personnel to ensure safety after at least 34 people were killed last month in suicide bombings in the southern city of Volgograd, some 700 km (400 miles) northeast of Sochi.
"Our task as the organisers is to ensure security to the participants of the Olympics and guests of this sports fete and we will do everything to that end," Putin said in an interview with several TV channels, according to excerpts run by ITAR-TASS news agency on Friday evening.
Putin vowed to annihilate "terrorists" after the bombings in Volgograd added to security fears ahead of the games in Sochi, a few hundred kilometres from the North Caucasus where Islamist separatists are fighting to carve out their own state.
"If we allow ourselves to show weakness, show fear, then it means we will be aiding terrorists and the accomplishment of their goals," Putin also said in the interview quoted on Friday.
North Caucasus faces nearly daily violence and at least five people, including two policemen, were hospitalised after two blasts in the provincial capital of Makhachkala on Friday evening, security officials said.
But, visibly relaxed and making jokes throughout the meeting with Sochi volunteers, Putin appeared confident and said he would like to go to some ice hockey matches during the Games if time allows.
"Everybody in our country likes figure skating, I do too. I like cross-country skiing, biathlon, Alpine skiing. This is what I know and what I like," Putin also said. (Additional reporting by Doina Chiacu in Washington; writing by Gabriela Baczynska; editing by Andrew Roche and Toby Chopra)