TOKYO — Japan urged Myanmar to uphold democracy and maintain peace on Monday after the military staged a coup and detained leader Aung San Suu Kyi.

“It is important that the relevant parties resolve the situation peacefully through dialogue and in line with the democratic process,” Japan’s top government spokesman, Chief Cabinet Secretary Katsunobu Kato, said in a press conference.

Myanmar’s military seized power and declared a nationwide state of emergency on Monday, Reuters news agency reported, with a spokesman for the ruling National League for Democracy saying Suu Kyi, President Win Myint and other senior party officials had been detained.

The coup followed a landslide victory by the NLD in the November general election, the results of which the military has disputed as fraudulent.

Kato said Japan was gathering information via its embassy in Yangon, Myanmar’s largest city, and would ensure the safety of its citizens.