(QHA) -

The leaders of the United States, Japan and Australia lined up together against Russia on Sunday, vowing to oppose Russian incursions into Crimea during a rare trilateral meeting held at the G20 summit in Brisbane, Reuters reports.

President Barack Obama, Japanese Prime Minister Shinzo Abe and Australian Prime Minister Tony Abbott said they would oppose "Russia's purported annexation of Crimea and its actions to destabilize eastern Ukraine," and were committed to "bringing to justice those responsible for the downing of Flight MH17."

Russian President Vladimir Putin has come under intense pressure from other G20 leaders over his government's backing for pro-Russian rebels in Ukraine, where a conflict has killed more than 4,000 people this year.

On Saturday, Western leaders warned Putin that he risked more sanctions if he failed to end his country's backing for the separatists. Russia has denied any involvement.

In addition to Ukraine and the Ebola crisis, the three leaders discussed "eliminating the North Korean nuclear and missile threat" and "addressing human rights in North Korea including the abductions issue," they said in a joint statement.

QHA