A U.S. navy soldier stands on the nuclear-powered aircraft carrier USS Nimitz in Busan, South Korea, on May 11, 2013. The USS Nimitz arrived here Saturday to join the South Korea-U.S. joint naval drills. (Xinhua/Park Jin-hee)

WASHINGTON, April 17 (Xinhua) -- The U.S. Defense Ministry has officially started a review of the country's nuclear posture and will submit a final report to President Donald Trump at the end of this year, the Pentagon announced Monday.

"Today, Secretary (James) Mattis directed the commencement of the review, which will be led by the deputy secretary of defense and the vice chairman of the Joint Chiefs of Staff, and include interagency partners," Pentagon spokeswoman Dana White said in a statement.

"The process will culminate in a final report to the president by the end of the year." said the statement.

The nuclear posture review was ordered by President Trump in a January executive action on military readiness, according to a theHill news daily report.

The January memo called for a review "to ensure that the United States nuclear deterrent is modern, robust, flexible, resilient, ready and appropriately tailored to deter 21st-century threats and reassure our allies."

Democratic lawmaker Adam Smith, a ranking member of the House Armed Services committee, said Monday he hopes the review includes a "thoughtful assessment" to "rethink what the priorities should be for a strong yet affordable nuclear arsenal."

"In the past, nuclear posture reviews have considered in depth the crucial role played by efforts to enhance strategic stability and prevent nuclear proliferation," he said in a statement.

"It is important that this review do the same. I hope that it includes a thorough assessment of policy options that would allow us to avoid a costly and dangerous nuclear arms race; and that it properly analyzes the enormous risks inherent in lowering the threshold for using nuclear weapons." said Smith.

Though planned since January under Trump's order, the start of the nuclear review comes at a time of high anxiety over increasing tensions on the Korean peninsula.

The last time the Pentagon conducted a nuclear posture review was in 2010.