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Australia, Canada and Japan said they would impose sanctions over the Ukraine crisis as more American allies add to efforts to punish Russia and its president, Vladimir V. Putin. Their moves follow coordinated efforts by the United States, the European Union and Britain to penalize Russia for what President Biden called the start of an invasion of Ukraine.

Australia will impose travel bans and financial penalties on eight members of Russia’s National Security Council, Prime Minister Scott Morrison said Wednesday. It will also punish several Russian banks and restrict trade with Donetsk and Luhansk, two separatist regions in Ukraine that Mr. Putin has recognized as independent.

Mr. Morrison said the actions would mean that Australia was “in lockstep” with efforts carried out by the United States and Britain.

Mr. Morrison said Russia was at “peak readiness” for a “full-scale invasion of Ukraine, and that is likely to occur within the next 24 hours.”

“This invasion is unjustified, it’s unwarranted, it’s unprovoked and it’s unacceptable,” he added.

Karen Andrews, Australia’s home affairs minister, warned of possible retaliation, including cyberattacks on critical infrastructure.

Prime Minister Justin Trudeau of Canada said Tuesday that it would enact prohibitions on dealing with Russian sovereign debt and impose sanctions on two Russian banks.

“Russia’s recent actions are a blatant attack on Ukrainian sovereignty, as well as a serious threat to the security and stability of the region and the international rules-based order,” Mr. Trudeau said.

Canada would also prohibit its citizens from carrying out transactions with Donetsk and Luhansk. Russian lawmakers who voted to recognize the two regions would also be penalized, Mr. Trudeau said.

Prime Minister Fumio Kishida of Japan said Wednesday that the country would enact similar sanctions against Russia, including prohibiting it from issuing new sovereign bonds in Japanese markets. Japan will also ban any trade with the breakaway republics in eastern Ukraine that Moscow recognized on Monday, freeze the assets of representatives of those republics and bar them from receiving visas.

Mr. Kishida said Japan “strongly condemned” Russia’s acts, which “clearly infringe Ukraine’s sovereignty and territorial integrity and are a violation of international laws.” He said Japan would carry out its sanctions in coordination with the international community and would consider further actions if the crisis worsens.