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United States President Donald Trump has landed back in the US after a surprise directive to begin nuclear weapons testing that raised the spectre of renewed superpower tensions.
Trump announced the order on social media, just as he was entering a summit with Chinese leader Xi Jinping in South Korea on Thursday.
It came days after Russia declared it had tested nuclear-capable, nuclear-powered cruise missiles and sea drones.
The blunt statement from Trump, who boasts frequently about being a “peace” president, left much unanswered.
There was ambiguity surrounding whether the reference was to testing weapons systems or conducting actual nuclear test explosions—activities the U.S. has refrained from since 1992.
“Because of other countries’ testing programs, I have instructed the Department of War to start testing our Nuclear Weapons on an equal basis,” Trump said in a post on his Truth Social platform.
Trump also said that the US has more nuclear weapons than any other country and that he had achieved this in his first term as president.
The Stockholm International Peace Research Institute said in its latest annual report that Russia possesses 5,489 nuclear warheads, compared to 5,177 for the United States and 600 for China.
In his post, Trump said — minutes ahead of his meeting with Xi — that China was expected to “be even within 5 years”, without substantiating the claim.
While both Russia and the United States adhere to an unofficial halt on nuclear warhead testing, they continue to hold military exercises with systems capable of deploying nuclear weapons.
In response to Trump’s announcement, Chinese foreign ministry spokesperson Guo Jiakun urged the US to “earnestly abide” by a global nuclear testing ban.
The Kremlin questioned whether Trump was well-informed about Russia’s military activities.
“President Trump mentioned in his statement that other countries are engaged in testing nuclear weapons. Until now, we didn’t know that anyone was testing,” Kremlin spokesman Dmitry Peskov told reporters.
Russia’s recent weapons drills “cannot in any way be interpreted as a nuclear test”, Peskov said. “We hope that the information was conveyed correctly to President Trump.”
Peskov then implied that Russia would conduct its own live warhead tests if Trump did it first.
“If someone departs from the moratorium, Russia will act accordingly,” Peskov said.
Russian President Vladimir Putin has repeatedly said that if any country tests a nuclear weapon, then Russia will do so too.
“Achieving denuclearization would be a remarkable development,” he noted. “We’re currently in talks with Russia about this, and should we proceed, China would also be included.”
The US has been a signatory since 1996 to the Comprehensive Nuclear-Test-Ban Treaty, which bans all atomic test explosions, whether for military or civilian purposes.
United Nations secretary-general António Guterres said through his deputy spokesman that “nuclear testing can never be permitted under any circumstances”.
Further muddying the waters, Trump also repeated in his remarks to reporters a previous claim that he wants negotiations on reducing nuclear weapons forces.
In the past 25 years, no nuclear power, aside from North Korea in 2017, has engaged in explosive nuclear testing.
Last US test in 1992
The US conducted 1,054 nuclear tests between July 16, 1945, when the first test was conducted in New Mexico, and 1992, as well as two nuclear attacks on Japan during World War Two.
It is the only country to have used nuclear weapons in combat.
The last US nuclear test explosion was in September 1992, with a 20-kiloton underground detonation at the Nevada Nuclear Security Site.
Then-president George HW Bush imposed a moratorium on further tests in October 1992 that has been continued by successive administrations.
Nuclear testing was replaced by non-nuclear and subcritical experiments using advanced computer simulations.
No nuclear power — other than North Korea most recently in 2017 — has carried out explosive nuclear testing in over 25 years.
Nevada congresswoman Dina Titus responded that she would introduce legislation to “put a stop” to any move to restore live weapons testing in her state.
US senator Jacky Rosen, also a Nevada Democrat, said in a post on X that Trump’s statement “directly contradicts the commitments I secured from Trump nominees … who’ve told me explosive nuclear testing would not happen & is unnecessary”.
