The leaders of Australia and Nauru have signed a treaty beefing up their nations' economic and security ties. With the deal, Canberra apparently aims to counter Beijing's influence over the South Pacific island.

Under the pact, Canberra has pledged to invest 100 million Australian dollars, or 64 million US dollars, over five years for education, health and social services in Nauru. It will spend another 25 million US dollars in the same period to strengthen Nauru's policing and national security.

Pointing out that his country is Nauru's largest economic, security and development partner, Australian Prime Minister Anthony Albanese said, "We view this partnership as a serious responsibility and a sign of the enduring respect between our two nations."

Nauruan President David Adeang said the treaty will strengthen his country's economy, enhance mutual security and ensure "growth and resilience" for Nauruans.

The accord also prevents third countries from accessing Nauru's critical infrastructure for security purposes. The nation, located in a strategically important region, switched diplomatic ties from Taiwan to China earlier this year.