Mr Joske told Sky News Australia: "[The CCP] has certainly escalated their language around taking Taiwan.
"Previously they would talk about the need to peacefully reunify with Taiwan.
"Now that language is really more and more talking about resolutely fighting against so-called Taiwan independence forces.
"But I think part of the challenge is that Xi Jinping has no real strategy to engage with Taiwan.''
"He's really only leaving himself this military option, but that would just be disastrous for China, for Taiwan and for the whole world."
Taiwan is working to increase energy inventories in a move to boost the island's resilience in the event of a crisis, a deputy economy minister said, as China stepped up military pressure to try to force Taiwan to accept Chinese rule.
China's blockade drills around Taiwan in August after a visit to Taipei by US. House Speaker Nancy Pelosi have heightened concerns on the island about the prospect of an attack by its giant neighbour, which has not ruled out using force to bring democratically governed Taiwan under its control.
Tseng Wen-Sheng, one of Taiwan's deputy economy ministers, told Reuters in an interview the Government is ramping up its natural gas and coal inventories, part of President Tsai Ing-wen's push to strengthen the island's "resilience" in an emergency amid growing global geopolitical and economic uncertainties.
"When it does happen, we need to be able to undertake pressure to a certain degree," Tseng said, answering questions on the prospect of a Chinese blockade or attack on trade-reliant Taiwan, which imports 98 percent of its energy.
By building new storage facilities across Taiwan, he said, the ministry is planning to raise natural gas inventories to more than 20 days by 2030, up from the current level of 11 days.
Mr Tseng said coal inventories would be increased in the coming years while those for crude would continue at a level of more than 100 days.