If Ukraine falls, further countries will face the wrath of Russian expansionism, Ukraine's top diplomat in Canberra warned as he reiterated his president's call for more aid.
Charge d'Affaires Volodymyr Shalkivskyi says Ukraine needs more aircraft, modern anti-aircraft systems and a no-fly zone over Ukraine to stave off the Russian advance as troops close in on the country's capital, Kyiv.
"(Russia's) ally Belarus needs access to the Baltic Sea and (needs) to go through the European Union and NATO members, so there is already clear evidence that in case Ukraine falls, then there will be next countries in line," he told the Seven Network.
"Our president is calling for the active participation of the world community and helping Ukraine to protect our land."
Ukrainian President Volodymyr Zelensky addressed the United States Congress via video link and pleaded with American lawmakers for more aid as he referenced Pearl Harbour and the September 11, 2001, terrorist attacks.
President Joe Biden announced the US would send an additional $US800 million ($A1.1 billion) in military aid, including anti-aircraft and anti-tank weapons, as well as drones, but Mr Zelensky reiterated his calls for a NATO-imposed no-fly zone.
His representative in Canberra, Mr Shalkivskyi, said Ukraine needed defensive systems and lethal support "in order for us to effectively sustain that military pressure that's coming from Russia".
"Russia has air superiority and the devastation that it caused on the ground in terms of civilian death and destruction of residential areas and civilian infrastructure is just striking," he said.
Mr Shalkivskyi said Russia had shown signs it was committing genocide by targeting civilians and attacking humanitarian corridors when civilians were trying to flee conflict zones.
"Every time our civilians tried to flee, Russian forces started shelling, killing civilians," he said.
"These mass killings and slaughters continue and we are calling for international partners to step in."
Australia has flagged it could send more military aid, with Prime Minister Scott Morrison saying this may mean more armaments with international partners.
A further round of sanctions is also on the cards.
The federal government reportedly has its eye on two billionaires - Oleg Deripaska and Viktor Vekselberg - with links to Russia's Rusal, one of the world's biggest aluminium manufacturers.
Rusal has a large financial stake in a Queensland aluminium refinery that sends millions of tonnes of the material to Russian entities.
Mr Deripaska was sanctioned by the UK government on March 10, alongside Chelsea football club owner Roman Abramovich, in a $27 billion hit on seven wealthy Russians.
Australia sanctioned Mr Abramovich four days later.
Mr Vekselberg was also recently sanctioned by the UK government.
A spokesperson for Foreign Minister Marise Payne said she was awaiting advice from the Department of Foreign Affairs and Trade on further sanctions.
"We are consulting and cooperating closely with partners on sanctions, and would note that the UK only sanctioned Viktor Vekselberg and Oleg Deripaska in recent days," the spokesperson said.
Senator James Paterson, who chairs parliament's intelligence and security committee, said the government was following a legally robust process in sanctioning individuals.
Senator Paterson said more countries needed to join in on sanctions against Russia to force Russian President Vladimir Putin to change course.
"The more of us who put that pressure on, the more likely that will be the case," Senator Paterson told Sky News.
"We won't only be helping the people of Ukraine who deserve our support, but we will also be helping people elsewhere in the world who have been facing the threat of incursion or invasion from their large neighbours."
with AP