In the late 1970's, already during the soviet era, there was a terrorist attack in Moscow:

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The 1977 Moscow bombings were a series of three terrorist bombings in Moscow on 8 January 1977. The attacks killed seven people and seriously injured 37 others. No one claimed responsibility for the bombings, although three members of an Armenian nationalist organization were executed early in 1979 after a KGB investigation and a secret trial. Some Soviet dissidents said that the suspects had an alibi.[1] Soon after the event Andrei Sakharov issued a public appeal, expressing concern that the bombings might "be a new provocation on the part of the organs of repression".[2] According to historian Jay Bergman, "who actually caused the explosion has never been determined conclusively".

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More about that: https://en.wikipedia.org/wiki/1977_Moscow_bombings

Did you read or hear about that?

More about that:

Armenian Terrorists in Moscow - VIDEO, PHOTOS

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On 8 January,1977 in Moscow the series of terrorist attacks was carried out, including the Moscow Metro. As a result 7 people died and 37 injured.

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More: http://en.azvision.az/news.php?id=27286