Washington and Pyongyang have recently been exchanging sharp statements.
Soderberg criticizes the president's lack of diplomacy and she personally wishes that the worldwide community increase pressure on North Korea rather than use outright force.
Trump's comment prompted North Korea's military to announce that it was considering an attack on the US territory of Guam.
The statement is a direct response to bipartisan criticism of the ultimatum Trump issued to North Korea on Tuesday. "This is tragicomedy of its own making".
Secretary of State Rex Tillerson said Wednesday there is no "imminent threat" from North Korea, despite Trump's remarks the day before.
Prime Minister Shinzo Abe says he will do everything he can to protect the Japanese people as tensions escalate over North Korean plans to send missiles flying over Japan toward Guam.
In recent days, Trump and the North Korean regime have engaged in heated rhetoric about the Asian nation's nuclear weapons programme.
He made comments Saturday while visiting his father's tomb in his ancestral hometown of Nagato in western Japan.
The ministry did not confirm whether Defense Minister Itsunori Onodera has already issued an order to shoot down incoming missiles.
The former intelligence director said he was concerned about the USA beginning an unnecessary war with North Korea.
Trump reiterated his bellicose warning to North Korea from earlier in the week on Thursday, telling reporters at his golf club in New Jersey that his threat to bring "fire and fury" if North Korea continued to threaten the United States may not have gone far enough. Trump's comments, however, do not appear to be backed by significant military mobilization on either side of the Pacific, and an important, quiet diplomatic channel remains open. I don't think we are there yet.