There are at least 3 International projects of these kind:
- the BEAR project from NW Russia to the whole Northern Baltic Region;
- the EMTESZ project around the TESZ zone from Russian Kaliningrad Region to the whole SW Baltic Region;
- the KIROVOGRAD project at the Voronezh Massive in SW Russia and adjacent areas of Belarus and Ukraine.
These projects implemented simultaneous long-period MT/MV soundings at many tens and even hundreds of sites. You may see information on them at my ResGate page.
See also information on the LADOGA project in NW Russia at the page of Elena Sokolova.
There are several regional projects - along regional profiles (hundreds km long) with seismic (CDP, DSS), EM (MT, TDEM), gravity, magnetic fields acquisition and deep drilling with well logging and sampling. It's government projects, but, as I know, data is not avaible for general consumption. Very few results were published (see, for example, Capter 13 in Electromagnetic Sounding of the Earth’s Interior: Theory, Modeling, Practice; Second Edition; Edited by Viacheslav V. Spichak; ELSEVIR, 2015; ISBN: 978-0-444-63554-9)