Global Conflicts Escalate, Nuclear Nonproliferation System Faces New Strains

United Nations building with numerous national flags outside.

As wars rage in Ukraine and Iran, the global rules meant to keep nuclear weapons in check are quietly coming apart.

Story Snapshot

Russia’s war in Ukraine and conflict with Iran are weakening core nuclear safety and nonproliferation rules.
Ukraine gave up nuclear arms for security promises that failed, sending a harsh message to other vulnerable countries.
Iran is threatening to walk away from nuclear limits while inspectors say they can no longer track its materials.
At the same time, the basic nonproliferation system still limits the number of nuclear states, creating a tense stalemate.

How the Ukraine War Shakes Trust in Nuclear Promises

Russia’s full invasion of Ukraine showed many nations that nuclear weapons can help an aggressor while blocking outside help to the victim. Ukraine once held Soviet nuclear weapons but gave them up in the 1990s and joined the Treaty on the Non-Proliferation of Nuclear Weapons as a non‑nuclear state. In return, the United States, Russia, and others signed the 1994 Budapest Memorandum, promising to respect Ukraine’s borders and sovereignty. Russia’s seizure of Crimea in 2014 and its 2022 invasion broke those promises and made security guarantees look weak.

Experts warn that this pattern sends a clear signal to other at‑risk countries: if you give up or skip nuclear weapons, you may stand alone when a stronger neighbor attacks. Scholars note that security threats and the lack of reliable allies are some of the main reasons states consider nuclear arms in the first place. For leaders watching Ukraine, the lesson can seem simple and grim. Nuclear weapons may now look like the only sure way to stop future invasions, feeding quiet pressure to start or expand nuclear programs.

Russia’s Nuclear Threats and the Erosion of Restraint

During the war, Russia has used nuclear threats to scare off deeper Western involvement in Ukraine. Russian officials have hinted that attacks on newly annexed regions could be treated as strikes on Russian territory, implying possible nuclear use if the regime feels cornered. This kind of “nuclear blackmail” breaks with past norms that kept nuclear language rare and careful. Analysts argue that such saber‑rattling chips away at the taboo against nuclear use and weakens faith in the Treaty on the Non-Proliferation of Nuclear Weapons.

International reports describe this as a “blow to the system of nuclear abstinence,” meaning the web of treaties and customs that discourage states from seeking nuclear arms. The concern is not that new nuclear powers have already appeared, but that the rules are losing moral force while major powers set bad examples. At the same time, the main United States–Russia treaty limiting long‑range nuclear weapons, known as New START, is set to expire without a clear follow‑on deal. For the first time in roughly fifty years, there may soon be no arms control treaty capping the two largest arsenals, deepening fear that nuclear risks are no longer under firm control.

Iran’s Nuclear Program and the Loss of Oversight

Iran’s nuclear program adds another layer of strain to global nuclear rules. United Nations briefings report that inspectors from the International Atomic Energy Agency say they lost “continuity of knowledge” about Iran’s nuclear material in 2026. This happened after Iran stopped following a stricter inspection deal called the Additional Protocol and limited outside access to its sites. Without regular field checks, it is much harder to know exactly what Iran is producing, storing, or planning, and that gap alarms both neighbors and great powers.

Political figures and commentators say Iranian lawmakers have threatened to rethink the country’s nuclear policy and even its place in the Treaty on the Non-Proliferation of Nuclear Weapons. They argue these threats grew stronger after foreign military strikes on Iranian nuclear facilities and rising pressure on the regime. From Iran’s point of view, some analysts claim nuclear weapons might look like a shield against further attacks, similar to the lesson many draw from Ukraine. Western governments, however, frame the crisis mainly as Iran breaking past commitments, not as a reaction to war, which fuels mistrust about whose story to believe.

Why Nuclear Proliferation Pressure Is Rising but Still Limited

Scholars studying nuclear history agree that security fears and technology access are the key drivers of nuclear weapons programs. As tensions grow and trust in major powers falls, research warns that “proliferation pressure” is rising, especially for states that feel exposed. Conflicts like those in Ukraine and Iran, plus worsening ties among the United States, Russia, and China, make more leaders quietly ask whether they need their own nuclear deterrent. Yet the same studies note that starting a nuclear program is hard, costly, and slow, which keeps the overall spread of nuclear weapons relatively rare.

Despite these pressures, the number of nuclear‑armed countries has stayed around nine for about twenty‑five years, which shows the core treaty system still has strength. The Treaty on the Non-Proliferation of Nuclear Weapons and the safeguards run by the International Atomic Energy Agency have long helped stop civilian nuclear material from being turned into bombs. But experts warn this balance is getting more fragile. If wars keep sending the message that nuclear arms are the only real protection and if inspectors lose access in places like Iran, the quiet restraint that has held for decades could give way to a new, more dangerous nuclear era.