U.S. Navy Rear Adm. Michael J. Dumont replied on the Pentagon's behalf, saying it's hard to give an estimate but that the only way to make sure North Korea's nuclear weapons program is destroyed would be a ground invasion.
Potential casualties from a conflict depended heavily on the intensity of any attack on South Korea's capital, Seoul, which lies just 35 miles (56 km) from the border, as well as how much advance warning the USA and its allies had, he said.
In terms of providing humanitarian assistance during or after conflict, Dumont said South Korea will have the primary responsibility for "post-conflict and transitional operations" on the Korean Peninsula.
Trump kicked off a 12-day Asian trip and is looking to present a united front with Japan against North Korea through meetings with Prime Minister Shinzo Abe amid heightened tensions over Pyongyang's nuclear and missile tests.
"The President needs to stop making provocative statements that hinder diplomatic options and put American troops further at risk", Mr Lieu's joint statement said.
A t a speech Sunday at Yokota Air Base in Fussa, Japan, Trump rallied the American service members and assured United States allies in the region that he had their backs in the face of the rogue regime's threats. It also cuts off a vital economic lifeline to North Korea by prohibiting exports of cotton products.
Korea's continuing efforts to expand its missile and nuclear weapons programs will be a main topic. "They are not only threatening in words, but they are switching over into action to ignite another Korean War", they said, referring to USA rhetoric.
Last month, President Donald Trump tweeted that Secretary of State Rex Tillerson was wasting his time trying to negotiate with North Korean leader Kim Jong-un. It was not pleasant for them, was it?' said Trump, who wore a leather bomber jacket as he addressed the troops. The exercises will take place for two days, according to Sputnik.
'We will never yield, never waver and never falter in defense of our freedom, ' Trump said.
" Together with our allies, America's warriors are prepared to defend our nation using the full range of our unmatched capabilities, said Trump, who was wearing a military-style bomber jacket".
"The letter, outlining what a potential conflict with North Korea would look like, said that it is hard to assess the "'best- or worst-case casualty scenarios'" from an attack from the North, noting the proximity of Seoul, South Korea's capital and largest city, to the Demilitarized Zone (DMZ). With North Korea's defeat - but at what cost?,' Givens said.