Azerbaijani tanks on Wednesday shelled positions in the breakaway Nagorny Karabakh region for the first time in more than 20 years, the rebel defence ministry said, as Armenia arrested a former army officer accused of spying for its archfoe. Armenia and Azerbaijan fought a bloody conflict over the disputed Nagorny Karabakh territory in the 1990s before reaching a tenuous ceasefire in 1994 but they have not signed a peace deal and clashes erupt regularly. The ethnic Armenian enclave in Azerbaijan enjoys the backing of the Armenian authorities. "For the first time since the ceasefire, Azerbaijan has used tanks on the...