Kornel Andzsans-Balogh contributes the fourth, and final installment, of our coverage of threats and challenges to Visegrad state energy security with a detailed look at Hungary. While the country has significantly increased its national security through transit diversification, through transmission interconnectors for electricity supply, and through greater gas storage, it remains vulnerable to excess country-of-origin dependence on natural gas from the Russian Federation. Having said this, Hungary's accomplishments are worth noting and instructive to other nations facing the same or a similar problem, not only in Europe but around the world.