Famine has been weaponized before. I don't think the history of famines caused by British colonialism is very well known. Here Sullivan and Hickel discuss this and how to assess the rate of excess death caused by policy.
How British colonialism killed 100 million Indians in 40 years https://www.aljazeera.com/opinions/2022/12/2/how-british-colonial-policy-killed-100-million-indians