Szijjártó said the fuel rods were delivered by ship to Bulgaria, then put on a train that traveled through Romania to Hungary. 

The fuel rods were delivered by rail via Ukraine, before the start of the war, then by air. With the air route over the northern part of Central Europe now impossible, an "entirely new route" was necessary, Szijjártó said.

The Paks nuclear power plant, Hungary's only commercial source of nuclear energy, accounts for about half of electricity generation in Hungary.