US Secretary of Energy Chris Wright says the nuclear weapons testing ordered by President Donald Trump will not involve nuclear explosions.
Trump announced during his trip to Asia last week that he had instructed the Department of Defense to resume the testing. But he did not give details.
The United States has not conducted a nuclear test explosion since 1992.
On Sunday Wright said during an appearance on a Fox News program: "I think the tests we're talking about right now are system tests. These are not nuclear explosions."
He added the testing is aimed at developing "sophisticated systems so that our replacement nuclear weapons are even better than the ones they were before."
An agency within the Department of Energy maintains and enhances the country's nuclear weapons stockpile.
After Trump's announcement, Russia said it will act accordingly if any country departs from the moratorium.
China called on the US to fulfill its obligations to non-proliferation.
Nihon Hidankyo, an organization representing survivors of the atomic bombings of Hiroshima and Nagasaki during World War Two, has criticized Trump's announcement .

Quiz 1:
What type of tests will be conducted by the US Department of Defense as per the statement made by Secretary of Energy Chris Wright?
A. Nuclear explosion tests
B. System tests (Not nuclear explosions)
C. Maintaining and enhancing the country's nuclear weapons stockpile tests
D. Testing aimed at developing sophisticated systems for replacement nuclear weapons

Quiz 2:
When did the United States last conduct a nuclear test explosion?
A. 1980
B. 1992
C. 2010
D. 2020

Quiz 3:
Which of the following countries has criticized President Donald Trump's announcement about resuming nuclear weapons testing?
A. Russia
B. China
C. United Kingdom
D. Japan (Nihon Hidankyo, an organization representing survivors of the atomic bombings of Hiroshima and Nagasaki)