Kursk Station is the Moscow terminal for trains to/from central Russia (Kursk and Nizhny Novgorod), eastern Ukraine (Donetsk and Kharkiv), and some Sapsan high-speed services from St. Petersburg. It is a little less than 10 km from the Oksana Hotel.
By taxi
The drive to the Oksana Hotel from the station will take about 30 minutes in reasonable traffic, or much more at peak times. Taxis should cost $30-40, or to save trouble you can book a transfer to meet your train here.
By metro
From Kurskaya Metro Station, connected to the concourse of the mainline station, take the brown circle line two stops counterclockwise to Prospekt Mira, change here to the orange line and travel three stops north to VDNKh. The Oksana Hotel is about ten minutes' walk from the metro.