President Donald Trump threatened "certain death" to elite forces in the Iranian regime and advised the country's military to lay down their weapons as the United States and Israel launched attacks on the country early Saturday.

U.S. Secretary of State Marco Rubio warned that Iran's reluctance to discuss its intercontinental ballistic missiles was a "big, big problem."

During his State of the Union address, Trump indicated he was considering attacking Iran if it refused to give up its nuclear program and effort to build long range missiles.

As the Department of Defense pushes for greater AI integration, researchers said the top models chose the nuclear option in nearly all war simulations.

As Israel and the US attacked Iran on Saturday, US President Donald Trump claimed Iran has continued to develop its nuclear program and plans to develop missiles to reach the US and appealed to the Iranian people to “take over your government.

By Joyce Lee and Jack Kim SEOUL, Feb 26 (Reuters) - North Korean leader Kim Jong Un said he would focus on expanding his country's nuclear arsenal and that prospects for improving relations with the U.

Estonia's foreign minister has signaled the eastern NATO member was open to having nuclear weapons stationed on its soil.

Moscow reiterates willingness to adhere to expired nuclear weapons treaty, "as long as the United States does not exceed the aforementioned limits."

Experts warn that the expiration of a long-standing nuclear arms control treaty between the two superpowers could mark the start of a new nuclear rivalry.

On Feb. 5, New START, the last treaty limiting U.S. and Russian strategic nuclear arms, will expire — a dark milestone. But President Trump has an opportunity to put off such a nuclear competition and explore whether new accords can help avoid it.

U.S. President Donald Trump said on Saturday that the United States had begun "major combat operations" in Iran, warning that there may be U.S. casualties.