Spartak Moscow face Uefa censure after a flare was fired on to the pitch by their fans during their 1-1 Champions League draw at Maribor in Slovenia. The crowd trouble comes as concerns grow about hooliganism at next year’s World Cup finals in Russia.

During a goalless first half, filled with missed opportunities, a flare was fired from the Spartak supporters massed at one end of the ground towards the centre of the pitch, landing close to the referee Deniz Aytekin, who was standing in the centre circle.

It is far from the first time that Spartak’s fans have overshadowed the team’s efforts. Spartak were fined a total £8,500 by the Russian football union after racist slogans were displayed on a banner and violence marred a league match against Arsenal Tula in April 2015.

A flare is fired onto the Stadium Ljudski vrt pitch in Maribor. Photograph: Twitter

Spartak, who welcome Liverpool to Moscow in their second group game in two weeks’ time, were held to a draw after Damjan Bohar’s 85th-minute equaliser for the hosts.

Elsewhere in the Champions League, the holders Real Madrid got their defence off to a winning start in Group H with Cristiano Ronaldo scoring twice and Sergio Ramos adding a third against Apoel Nicosia.

Shakhtar Donetsk stunned Serie A’s Napoli with goals either side of half-time to win 2-1 in their Group F match, while Besiktas were also surprise winners in Porto, with Ryan Babel completing the scoring for the Turkish side in a 3-1 victory in Group G.