Key points:
The statement from world leaders says Mr Navalny s poisoning is another grave blow against democracy in Russia
The UN human rights chief this week said a pattern of poisonings of Russian citizens was profoundly disturbing
Medical officials in Germany say Mr Navalny may suffer long-term consequences from the severe poisoning
Australia, along with Germany, the US, UK, Italy, France, Japan and the European Union, said in a statement they were united in condemning the poisoning of Mr Navalny with the Soviet-era nerve agent Novichok, the use of which was confirmed by German medical experts. Any use of chemical weapons, anywhere, anytime, by anybody, under any circumstances whatsoever, is unacceptable and contravenes the international norms prohibiting the use of such weapons, the statement said.