Ruscosmos is about a reusable gas-cooled fission reactor that powers a generator. This would power a plasma thruster.
They have made some physical models and some video simulations. They claim to have made components and a drip heat radiator.
Russian nuclear rocket claims from 2016, 2011 and 2010
"At present we are testing several types of fuel and later we will start drafting the design," Kovalevich said. "The first parts [of the nuclear engine] should be built in 2013, and the engine is expected to be ready by 2017."
The engine is being developed for interplanetary manned spacecraft to ensure that Russia maintains a competitive edge in the space race, including the exploration of the Moon and Mars.