"Rosatom executives offered assurances to Hungary at the talks that they remain capable, from a technological perspective, of carrying out the investment," Szijjártó said. He added that Hungary's atomic energy authority is weighing applications for permits for the project, and when these are awarded, the construction work at the plant "can enter the next phase".

He said nuclear energy is "cheap, safe and environmentally friendly", while it ensures a "significant degree" of energy supply independence and stability, as fuel rods can be stored for "many years" before they are used.

Rosatom is the general contractor for the construction of another two blocks at the Paks power plant, Hungary's sole commercial source of nuclear energy. The plant accounts for about half of Hungary's electricity generation.