NEW DELHI, October 21 (Reuters): Australia will join three-way naval exercises involving the United States, Japan and India, in a move that could provoke concern from China, which has criticised similar joint drills in the past. Here are some of the most common questions on the Malabar exercise: WHAT IS THE MALABAR EXERCISE? The Malabar naval exercise began in 1992 as a training event between the United States and India. Japan joined it in 2015, but Australia has not