Dhaka, June 2 -- Beijing says the US is touting Cold War mentality after Defense Secretary Pete Hegseth calls China a threat to the region.China has warned the United States against "playing with fire" over Taiwan in response to US Defense Secretary Pete Hegseth calling the Asian power a "threat to the region" at a high-profile summit in Singapore.Speaking at the Shangri-La Dialogue on Saturday, Hegseth said China was "credibly preparing" for military action to shift Asia's power balance, accusing Beijing of rehearsing a potential invasion of Taiwan.China considers Taiwan, a separately governed island, to be a part of its territory and has vowed reunification by force if necessary. Taiwan's government rejects Beijing's sovereignty claims, s...