Syrian first lady Asma al-Assad has expressed her gratitude for the well wishes she has received in her first appearance since the announcement of a leukaemia diagnosis. The office of her husband President Bashar al-Assad announced last week that Asma had been diagnosed with an aggressive form of bone marrow and blood cancer. In a video posted on her Instagram account, Asma, wearing a blue jumper and sitting on a sofa, said she has received “heartfelt messages of love and support”. “Since the announcement of my leukaemia diagnosis, I have received many heartfelt messages of love and support th…