Yemen and South Sudan are the correct answers. Both of these countries have experienced severe famine and acute malnutrition, leading to the deaths of thousands of people due to war and ethnic conflicts.

Yemen:

Yemen has been facing a grave humanitarian crisis, with a significant portion of its population suffering from severe famine and starvation. The country has been enduring a civil war since 2015, when Houthi rebels took control of the capital, Sanaa, and ousted the internationally recognized government. The conflict has escalated, leading to widespread violence and displacement of people, disruption of essential services, and a collapsing economy.

Key Points:
- The war in Yemen has resulted in the destruction of infrastructure, including hospitals, schools, and water facilities, creating a dire humanitarian situation.
- The ongoing conflict has severely impacted food production and distribution, leading to a scarcity of food and a sharp increase in food prices.
- According to the United Nations, more than 20 million people in Yemen are in need of humanitarian assistance, with over 10 million suffering from acute malnutrition.
- The situation is particularly dire for children, with reports of widespread child malnutrition and a high mortality rate among infants.

South Sudan:

South Sudan, the world's youngest country, has also experienced severe famine and starvation caused by ongoing ethnic conflicts and political instability. Following its independence from Sudan in 2011, South Sudan descended into a civil war in 2013. The conflict is primarily between forces loyal to President Salva Kiir and those supporting former Vice President Riek Machar.

Key Points:
- The civil war in South Sudan has resulted in the displacement of millions of people, disrupting their access to food, water, and healthcare.
- The conflict has also led to the destruction of agricultural lands and livelihoods, exacerbating the food crisis in the country.
- The United Nations estimates that over 7 million people in South Sudan are in need of humanitarian assistance, with approximately 1.3 million children suffering from acute malnutrition.
- The situation is further aggravated by economic challenges, limited infrastructure, and a lack of access to basic services.

Conclusion:

In conclusion, Yemen and South Sudan are two countries that have recently witnessed severe famine, acute malnutrition, and starvation due to war and ethnic conflicts. The ongoing violence and disruption of essential services have created dire humanitarian crises in both nations, leading to the suffering and deaths of thousands of people, particularly children. International efforts are required to address these urgent humanitarian needs and work towards sustainable peace and stability in these countries.