Pyongyang Sought to Break Moscow's Grip With 0.26 Percent Uranium Ore

By Roy Castellano · August 14, 2026

North Korea secretly targeted Prague for uranium-mining gear and a reactor while diplomats in Geneva fought to freeze the nuclear map during the mid-1960s.

Ferenc Szabó, the Hungarian Ambassador to North Korea, filed a telegram that cuts through the diplomatic pleasantries of the Eastern Bloc. The record, a published English translation from the Cold War International History Project, captures a moment of quiet procurement in the mid-1960s. In it, Szabó reports that the Czechoslovak ambassador had shared a specific request from the DPRK, relayed on February 12 by the Korean secretary of the Korean-Czechoslovak Intergovernmental Economic, Technical, and Scientific Consultative Commission.

Pyongyang was not asking for consumer goods or light industrial textiles. They wanted two things: the delivery of "uranium-mining equipment" and the construction of a 440-megawatt nuclear power plant. For a targeting analyst, these two requests, when paired, signal a specific kind of ambition. A power plant provides electricity, but mining equipment provides the means to feed a fuel cycle. You do not ask for the tools to dig your own uranium if you are content to rely on the Soviet Union for your fuel rods.

"Deliver Uranium-Mining Equipment"

The request was routed through the Czechoslovak embassy, highlighting the internal shopping lists of the socialist world. Czechoslovakia possessed a sophisticated industrial base and nuclear expertise that the DPRK lacked. By targeting Prague, Pyongyang was attempting to diversify its technical dependencies, ensuring that its nuclear path was not solely contingent on the whims of Moscow.

In the logic of deterrence, the ability to extract and process raw ore is the first and most critical step toward autonomy. If you control the mine, you control the timeline. The specific request for "uranium-mining equipment" suggests that the DPRK was moving beyond theoretical physics and into the dirt. They were looking for the hardware of extraction—the drills, the crushers, and the processing gear required to turn raw earth into yellowcake.

0.26 Percent

Szabó's telegram contains a parenthetical note that is perhaps more revealing than the official request. He mentions hearing from the Soviet ambassador that the DPRK possessed "two important uranium quarries." The Soviets had already done the math on the ore. In one location, the uranium content was 0.26 percent; in the other, it was 0.086 percent.

To the uninitiated, these numbers look negligible. To a war-plans analyst, they are a map. While 0.26 percent is not a rich deposit by global standards, it is entirely viable for a state determined to achieve a threshold capability. The presence of these deposits, known and monitored by the Soviets, provided the geological justification for the request to Czechoslovakia. Pyongyang knew what they had in the ground; they simply lacked the machinery to get it out.

Geneva, 1965

This exchange took place against the backdrop of a global effort to freeze the nuclear map. According to the public record, between 1965 and 1968, the Eighteen Nation Committee on Disarmament was meeting in Geneva to negotiate what would become the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). The stated objective of the NPT was to prevent the spread of nuclear weapons while promoting cooperation in the "peaceful uses of nuclear energy."

This "peaceful uses" clause has always been the soft underbelly of non-proliferation. It creates a legal corridor through which a state can acquire the technology for enrichment and reprocessing—the same technology required for a bomb—under the guise of energy independence. A 440-megawatt plant is a substantial piece of infrastructure, but it also serves as a perfect cover for the development of a nuclear cadre. By framing their needs as technical and economic, the DPRK could pursue the precursors of a weapons program while the diplomats in Geneva argued over the definitions of disarmament.

The Soviet Union’s role here is one of quiet observation. The Soviet ambassador knew the exact grade of the ore in the Korean quarries, and that information flowed to the Hungarian embassy. Moscow was the landlord of the bloc, keeping a ledger of every resource and every ambition among its satellites and allies. Whether the Soviets encouraged the DPRK to approach Czechoslovakia or merely tolerated it is not recorded in Szabó's telegram.

Related files in the Foreign Relations of the United States (FRUS) archives from the 1960s deal with Korea, and later CIA reading room documents track the chronology of North Korean activity through the 1980s. Those records show a pattern of persistent pursuit, but Szabó's report captures the early, raw phase of that pursuit—the moment when the request was simply for the tools to start digging.

The telegram does not record the response from Prague. It does not say if the mining equipment was shipped or if the blueprints for the 440-megawatt plant ever left the Czechoslovak drafting tables. It leaves us only with the request and the ore percentages, an unresolved ledger of intent.