<span class="chinese-post-title">趁火打劫</span>Loot a Burning House from the <span class="chinese-post-title">三十六計</span> Thirty-Six Stratagems

趁火打劫

敵之害大，就勢取利，剛決柔也。

"When a country is beset by internal conflicts, when disease and famine ravage the population, when corruption and crime are rampant, then it will be unable to deal with an outside threat. This is the time to attack."

Quoted from Chinese Classics and Translations