After the United States launched strikes targeting ISIS bases in northwest Nigeria on Christmas Day, questions remain concerning the strategy and details of the operation.Here is what we know:For all the latest headlines follow our Google News channel online or via the app.Who was involved?US President Donald Trump was the first to announce the strikes, initially raising concern among Nigerians that their sovereignty may have come under attack.Later, both countries said that they were involved, and that the strikes had the approval of Nigerian President Bola Tinubu.The Nigerian military was involved at some level and according to Nigeria’s Information Minister Mohammed Idris, the attack was carried out with the “full involvement of the Armed Forces of Nigeria.”Which group was targeted?Washington said it targeted militants linked to ISIS and US African command said there were multiple casualties, without providing details of precise targets among the multiple armed groups operating in