Berne - Neutral Switzerland is prepared to act as mediator to help resolve the North Korea crisis, including by hosting ministerial talks, Swiss President Doris Leuthard said on Monday.

Leuthard said Swiss troops were deployed on the demarcation zone between South Korea and North Korea and the country had a long history of neutral diplomacy.

But China and the United States had to take their share of responsibility, she added.

"We are ready to offer our role ...as a mediator," Leuthard told a news conference. "It is really time now to sit down at a table. Big powers have a responsibility."

South Korea to deploy four remaining THAAD launchers