Dillmann can take comfort in the knowledge that the Russian Time time is largely a rebadged iSport, having acquired much of its assets and equipment - and even some personnel - in the deal to take over that team's GP2 grid spot in 2013. Dillmann's original successful GP2 Final début had been with the iSport team.
"His talent and experience will be key to our objective of taking Russian Time to the top of the standings this season," said Mazepa of the team's first-ever driver signing. "Moreover, I would like to add that I believe Tom can be a title contender this season as well. He has what it takes to win from the start.
"He can also be a very valuable teammate to anybody who wants to make an assault for 2013 GP2 crown as well," he continued.
The team principal added that no decision had yet been made about who would take the second seat in two weeks time in Malaysia: "We're currently looking for our second driver who will help us in our fight for the Series title."
As well as Dillmann, Russian Time also tried out Britain's 2012 Formula Two champion Luciano Bacheta, Switzerland's 2011 Formula Two runner-up Christopher Zanella, and current Sauber F1 test and reserve driver Robin Frijns during their three days in Barcelona.
Other teams still to announce their drivers are Trident Racing and Hilmer Motorsport. There are also single seats still open at Caterham Racing and Venezuela GP Lazarus.