Dhaka, March 30 -- Russian-born tennis world number 12 Daria Kasatkina announced Saturday she is switching to play under the Australian flag.The 27-year-old, who has previously described the war in Ukraine as a "nightmare", said on Instagram she was "delighted" to reveal Australia had approved her application for permanent residency.Kasatkina said she loved Australia and looked forward to making Melbourne her home."As part of this, I am proud to announce that I will be representing my new homeland, Australia, in my professional tennis career from this point onwards," she said."Obviously there are parts of this decision that have not been easy," the player added, thanking her family and coaches for their support."I will always have respect...