It is reported by the site "Moscow 24" with reference to the press service of the capital's zoo.
Travel passes can be purchased at machines installed at the stations of the Ring line and inside the ring.
It is noted that the new edition of "Troika" is timed including the 155th anniversary of the founding of the city zoo.
On June 5, Russian President Vladimir Putin and Chinese President Xi Jinping visited the Moscow Zoo, where two bamboo bears, Dindin and Ruyi, were brought from China earlier.
Leaders were the first guests of the new pavilion.