即そく時じ停てい戦せん

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Meanings

1

noun

immediate cease-fire

Used in military, political, and news contexts to demand or declare an instant halt to hostilities.

instant, namely, as is

時time, hour

停halt, stopping

戦war, battle, match

停てい戦せん
停戦 is a general 'cease-fire' or 'armistice'; 即時停戦 specifies that it must happen immediately.
休きゅう戦せん
休戦 is a 'truce' or 'suspension of hostilities', often temporary; 即時停戦 emphasizes the urgency of stopping fighting right away.

Compound of 即時 (immediate) and 停戦 (cease-fire).