Zlobina and Sitnikov teamed up in June 2001. Early in their career, they represented Russia and were coached by Igor Gavrin and later Olga Riabinina. In 2005, they moved with Riabinina from Kirov to Rostov-on-Don. In 2006, Zlobina/Sitnikov won the bronze medal in Hungary and gold in the Czech Republic on the Junior Grand Prix circuit. Their final international event representing Russia was the 2008 Nebelhorn Trophy, where they finished 5th. In May 2009, they moved with Riabinina to Moscow and joined Elena Kustarova and Svetlana Alexeeva's group. In the 2009–10 season, Zlobina/Sitnikov made no international appearances but competed at the Russian Championships, where they finished 5th.