TOKYO - Prime Minister Shinzo Abe, in an interview published on Saturday, said Japan was ready to be more assertive towards China as Beijing threatened to strike back if provoked.
A top retired Chinese diplomat said any move by Tokyo to contain China could amount to an attempt to conceal ulterior motives in the region and prove to be "extremely dangerous".
And the defence ministry warned Japan not to underestimate China's resolve to take whatever measures were needed to protect itself.
Abe, interviewed by the Wall Street Journal, said Japan should take the lead in guarding against what he said might be an attempt by China to use force to attain its diplomatic goals.
He said he had realised at recent meetings with South East Asian leaders that the region sought leadership from Tokyo in terms of security amid China's more forthright diplomacy.
"There are concerns that China is attempting to change the status quo by force, rather than by rule of law. But if China opts to take that path, then it won't be able to emerge peacefully," he told the newspaper.
"So it shouldn't take that path and many nations expect Japan to strongly express that view. And they hope that as a result, China will take responsible action in the international community."
China took issue with a Japanese media report saying Abe had approved a policy for Japan to shoot down foreign drones that ignore warnings to leave its airspace.
"Don't underestimate the Chinese army's resolute will and determination to protect China's territorial sovereignty," Defence Ministry spokesman Geng Yansheng said on the ministry's website. "If Japan does resort to enforcement measures like shooting down aircraft, that is a serious provocation to us, an act of war.
"We will undertake decisive action to strike back, with every consequence borne by the side that caused the trouble," Geng added.