ERIKAS MWISI KAMBALE UGANDA and Democratic Republic of Congo (DRC) have mounted air and artillery strikes in a joint operation in eastern Congo against an Islamic State-linked militia, both countries said. Three witnesses also said that Ugandan troops crossed the border into DRC at Nobili in the afternoon. DRC's government spokesman Patrick Muyaya denied Ugandan soldiers had crossed but Ugandan army spokeswoman Flavia Byekwaso said they had. The strikes targeted the Allied Democratic Forces (ADF) militia, which has been based in the DRC since the late 1990s and is blamed for killing hundreds of villagers in raids after it pledged…