Igor Kochetkov had been scheduled to speak at human rights summit
Concerns over Russia's gay rights record discussed
Putin trying to retain grip on power
Stock exchange cancels plan to let delegation ring bell
'It's getting scarier each day'
Urge end to country's anti-gay crackdown
Thomas Roberts co-hosted event that took place in Moscow
Activist alleges police said they did not see any evidence that a crime took place.
Russian LGBT rights advocate dismissed comments
Gay MSNBC anchor's announcement comes amid outrage over Russia's LGBT rights record
