Yemen
The Yemen blockade by Saudi Arabia aligned forces, along with Houthi interference with aid deliveries, is claimed to have contributed to the deaths of 130000 from 2016 to December 2020.
Since 2016, a food insecurity crisis has been ongoing in Yemen which began during the Yemeni Civil War.[10] The UN estimates that the war has caused an estimated 130,000 deaths from indirect causes which include lack of food, health services, and infrastructure as of December 2020.[11] In 2018, Save the Children estimated that 85,000 children have died due to starvation in the three years prior. *
Same claim repeated on an NGO relief website.
It received some/quite a bit of attention, and some/quite a bit of condemnation, but one can't say much came out of it. If things have gotten better it's mostly because the belligerents chilled out for other reasons, of a more military/diplomatic than humanitarian nature.
No, "the West" did not shine, the Houthis being Iran-backed, and Saudi being oil-rich, efforts to throttle them were not too closely scrutinized.
The United Nations human rights chief warned on Monday that thousands of people may have died of starvation during sieges affecting nearly half a million people in war-torn Syria.
That's more on the Syrian government + its main backer, Russia. Hard to get much done there as well, UN veto et all.
*
see comments, numbers do seem a bit sloppy.