Myanmar's military has taken power for the next year after removing the elected government through a coup.
The army also arrested top leaders of the ruling National League for Democracy, including Aung San Suu Kyi and President Win Myint.
America and Australia reacted strongly to this incident.
White House spokeswoman Jane Psaki said in a statement that the United States rejects any attempt to alter election results or obstruct the process of democratic transition of power.
If this decision is not changed, we will take action.
And Australia has also condemned this military coup. The country said it was deeply concerned about the arrest.
Foreign Minister Marice Payne said, "We call on the military to abide by the rule of law."
We demand immediate release of political leaders who have been detained illegally. '
According to the country's military-controlled TV channel Myawaddy News, Defense Commander-in-Chief Min Aung Hlaing will serve as Myanmar's head of government during the state of emergency.