President Trump is pressuring Iran to either curtail its nuclear program or face military strikes, after Iran amassed a large stockpile of highly enriched uranium. Here's what to know.

A Trump administration official said that a remote seismic station in Kazakhstan measured an “explosion” in western China on June 22, 2020. China denies conducting a test.

A US official says a seismic station in Kazakhstan collected evidence of an alleged China nuclear test at Lop Nur in June 2020.

WASHINGTON — The United States is ready to carry out low-yield nuclear tests to match alleged secret explosions by China and Russia, ending a decades-old moratorium, a senior official said Tuesday. New START,

The U.S. claims that China conducted a secret nuclear test near Lop Nur in 2020, while Beijing categorically denies it. Tensions are rising in the global nuclear arms race.

The allegations were leveled by U.S. officials late last week. Arms control experts worry that norms against nuclear testing are unraveling.

The US accused China of secret nuclear tests, banned under international agreement, that were building toward tests of larger nuclear warheads.

Under a proposed nuclear deal with the United States, Saudi Arabia could gain uranium‑enrichment capabilities and come closer to developing a nuclear weapon — prompting a nuclear arms race in West Asia amid surging US‑Iran tensions.

Turkish FM Hakan Fidan also said that the idea that US or Israeli airstrikes on Iran could lead to regime change was "a pipe dream. " Turkish Foreign Minister Hakan Fidan warned that Turkey could be

At a event in Washington D.C., A U.S. official said a remote earthquake in 2020 was caused by a Chinese nuclear test.

US intelligence agencies believe that China is developing a new generation of nuclear weapons and has conducted at least one covert explosive test in recent years as part of a broader push to completely transform its nuclear arsenal into the world’s most technologically advanced,