2019: Australian intelligence services conclude that China was responsible for a cyber-attack on Australia's parliament and three largest political parties in the run-up to a May election.
April 2020: Australian PM Scott Morrison begins canvassing his fellow world leaders for an inquiry into the origins of the coronavirus pandemic. Britain and France are initially reluctant but more than 100 countries eventually back an investigation.
April 15: Morrison is one of the few leaders to voice sympathy with Donald Trump's criticisms of the World Health Organization, which the US president accuses of bias towards China.
April 21: China's embassy accuses Australian foreign minister Peter Dutton of 'ignorance and bigotry' and 'parroting what those Americans have asserted' after he called for China to be more transparent about the outbreak.
April 23: Australia's agriculture minister David Littleproud calls for G20 nations to campaign against the 'wet markets' which are common in China and linked to the earliest coronavirus cases.
April 26: Chinese ambassador Cheng Jingye hints at a boycott of Australian wine and beef and says tourists and students might avoid Australia 'while it's not so friendly to China'. Canberra dismisses the threat and warns Beijing against 'economic coercion'.
May 11: China suspends beef imports from four of Australia's largest meat processors. These account for more than a third of Australia's $1.1billion beef exports to China.
May 18: The World Health Organization backs a partial investigation into the pandemic, but China says it is a 'joke' for Australia to claim credit. The same day, China imposes an 80 per cent tariff on Australian barley. Australia says it may challenge this at the WTO.
May 21: China announces new rules for iron ore imports which could allow Australian imports - usually worth $41billion per year - to be singled out for extra bureaucratic checks.
June 5: Beijing warns tourists against travelling to Australia, alleging racism and violence against the Chinese in connection with Covid-19.
June 9: China's Ministry of Education warns students to think carefully about studying in Australia, similarly citing alleged racist incidents.
June 19: Australia says it is under cyber-attack from a foreign state which government sources say is believed to be China. The attack has been targeting industry, schools, hospitals and government officials, Morrison says.
July 9: Australia suspends extradition treaty with Hong Kong and offers to extend the visas of 10,000 Hong Kongers who are already in Australia over China's national security law which effectively bans protest.
August 18: China launches
