Southern commander Aweys had announced this new strategy in a media interview shortly after the withdrawal from Mogadishu in August 2011. Al-Shabaab increasingly avoided direct military combat and large battles, in favour of "dictat[ing] the conflict's pace by undertaking smaller ambushes at locations of its own choosing". It also developed a strategy of maintaining a "semi-territorial presence" in key regions and parts of key cities: while it no longer had exclusive and military authority over substantial territory, it retained a sporadic presence, and therefore significant influence, in many places.Nonetheless, by 2016, al-Shabaab was viewed as significantly weakened by the military campaign against it, with earlier losses compounded in 2014–15 by Operation Indian Ocean, a joint endeavour by AMISOM, the Somali government, and the United States. The Somali government claimed in October 2014 that over 700 al-Shabaab militants had surrendered since September, when it had extended an amnesty offer to them. Reports of further senior defections continued into 2015. Moreover, an American drone strike killed Godane on September 1, 2014; he was succeeded as al-Shabaab leader by Ahmad Umar Abu Ubaidah, who took office the same week. Other senior members were killed in armed clashes or by American drone strikes in 2014 and 2015. According to some reports, since Godane's death, the group has placed less weight on global jihad than on local grievances. 2018–2022: Resurgence In October 2017, more than 500 people were killed by a suicide truck bombing in Mogadishu. Al-Shabaab did not claim responsibility for the attack but was suspected of involvement. In December 2019, another suicide truck bomb marked the beginning of a series of al-Shabaab attacks on the capital city, which continued into 2022. Al-Shabaab also targeted American military personnel in an attack on a Kenyan base in January 2020, and in July 2022 launched an unusually bold, though short-lived, incursion into Ethiopian territory. By 2020, the group's strategy of semi-territorialism allowed it operate freely in much of rural Somalia, with its primary base in the Jubba River Valley, although air strikes against its leaders continued; and it has recently won military successes against the government. It had also expanded its operations in Puntland, prompting a military offensive by Puntland forces in 2021. As of July 2022, al-Shabaab is generally considered to be "resurgent", a situation partly enabled by a reduction in the number of American air strikes, and possibly motivated by competition with Islamic State