Senator Wong held talks with Fiji Prime Minister Sitiveni Rabuka in the Pacific island nation's capital, Suva, as they spruiked the yet-to-be-signed Vuvale agreement between the two countries.
It comes as Australia's efforts to secure a similar agreement with Vanuatu were dealt a blow following interventions from Beijing.
Australia's bid for a $500 million deal with Vanuatu was shelved after the Pacific nation raised concerns it could limit its ability to seek funding from other countries.
Vanuatu is in ongoing discussions over a similar deal with Beijing and has received millions of dollars for infrastructure works from China.
Senator Wong did not directly respond when asked if she knew of or expected any pushback from Beijing over the Vuvale pact with Fiji.
"We are a sovereign nation, as Fiji is, and we will make our decisions in our sovereign interests," she said.
Appearing alongside Pacific Minister Pat Conroy, the foreign minister said the Vuvale agreement would benefit both Australians and Fijians.
"This goes to our objective of a peaceful, stable and prosperous region," she said.
"Australians know we live in contested times, Australia knows and Australians will understand and see the challenges that our external environment places upon us.
"What the government has been very focused on is ensuring that we work to assure Australia's interests and security in these times."
There were few details as to the specifics of the agreement, with Senator Wong confirming negotiations were ongoing.
However, she said the agreement would have three pillars: security, the economy and people.
Mr Conroy told the Fijian media the agreement would help both countries tackle transnational crime, which he described as a shared threat.
He also announced Australia would give the Fijian government $30 million to assist in the ongoing fuel crisis.
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