The military in Myanmar, also known as Burma, took over power in a coup against the government.
The military detained leader Aung San Suu Kyi and declared a one-year state of emergency.
The opposition groups accuse the leader of failing to address claims of widespread voter fraud in their elections last November.
The military says it will hold a new election one year from now, when the state of emergency ends.
For now, Myanmar has paused all air travel into the country.