Australian dollar declined against most major rivals as the US dollar strengthens, while risk aversion spreads.
Media outlets reported that Congress and the White House are preparing legislation to ban Russian energy exports to hurt the Russian economy.
The Russian army is carrying on its military advance in Ukraine, controlling more and more cities.
The German government responded to calls for banning Russian energy imports, by saying that European countries can't meet their energy requirements without Moscow.
Analysts expect Kiev to fall in no time, and for the government to move abroad according to a recent CNN report.
AUD/USD fell 0.7% as of 18:09 GMT to 0.7324, with an intraday high at 0.7439, and a low at 0.7311.