The newly-elected Somali president has declared war on the Islamist militants while offering an amnesty to disaffected fighters.
Even as Brexit looms, May said a '"global Britain" would drive international efforts to support the African nation.
After a five-year lull, pirates have launched a spate of attacks off Somalia's coast—and a potential famine could be the reason.
6.2 million Somalis are in need, many of whom live under al-Shabab's rule.
Some 16 million people in the region are in urgent need of food, water and healthcare.
The first female presidential candidate in Somalia's history, Dayib pulled out of the race in December 2016, citing corruption.
Somalia is at risk of another deadly famine, six years after the last killed 250,000 people.
The U.S. intervention in Somalia is not remembered fondly, but it saved thousands of lives.