Prime Minister Tony Abbott has marked his first year in office with a pledge to keep Australia safe in a time of increasing global uncertainty.

Mr Abbott will return from a three-day visit to India and Malaysia to spend Father’s Day in Sydney and celebrate his government’s first year in power.

The prime minister said his government had delivered on its promise to tackle debt and repeal the carbon tax, and had signed two free trade deals with Australia’s major trading partners Japan and South Korea.

But it’s events on the world stage that have overshadowed the prime minister’s domestic agenda this year.

Mr Abbott said the rise of extremism in Syria and Iraq and the downing of MH17 in eastern Ukraine had tested Australians like never before. ”

As a nation, we’ve also faced serious challenges in the past year because of the increasingly uncertain world in which we live,” Mr Abbott said in a video address to mark his first year as prime minister.

“In an increasingly uncertain world, we are determined that our nation will be secure.”

Mr Abbott has promised to spend an additional $630 million on counterterrorism measures to combat the threat of Australians returning home from battlefields in the Middle East.