The answer is Kleptocracy.
Socialism is an economic and political system where the means of production are owned and controlled collectively or by the government, aiming to distribute resources more equally among the population. It does not inherently involve the exploitation of national resources for personal gain by ruling elites.
Capitalism is an economic system characterized by private ownership of the means of production and operates for profit. While it can lead to wealth disparities, it is not defined by the exploitation of national resources by ruling elites for personal gain.
Kleptocracy is a term used to describe a government where the ruling class exploits national resources and uses their power to enrich themselves at the expense of the wider population. This term directly addresses the concept of ruling elites exploiting resources for personal gain.
Colonialism refers to the practice of acquiring and maintaining colonies or territories, often by a more powerful country, and exploiting them economically. While it involves exploitation, it is not specifically about ruling elites within a government exploiting their own national resources for personal gain.
Feudalism is a historical system where land was owned by lords who allowed vassals to use it in exchange for military service or labor. It is not characterized by the exploitation of national resources by ruling elites for personal gain in the modern sense.