emergency government
A government formed or operating under emergency conditions, such as during a national crisis or disaster.
After the major disaster, an emergency government was established.
臨時政府 is a provisional or interim government, often set up during a transition period, while 非常事態政府 specifically implies a government formed in response to an emergency or crisis.
Compound of 非常事態 (emergency situation) and 政府 (government).