In the first leaders' summit between Joe Biden and Xi Jinping, the Chinese president said his country would remain patient on the question of Taiwan.
The secretary of state said on Wednesday that the U.S. and its allies would "take action" if China attacked Taiwan.
From reserve numbers to fighter jets, Taiwan is playing catch-up in a military buildup race it will never win.
Secretary of State Antony Blinken emphasized actions that could be taken now in order to prevent conflict.
The Taiwan Relations Act, which forms of part of the U.S. "one China" policy, was supported by then Senator Joe Biden in 1979.
In response to a U.S. congressional delegation visit to Taiwan, the Chinese People's Liberation Army has been holding preparedness drills near the island.
Paul Keating, who was prime minister of Australia from 1991 to 1996, has criticized the AUKUS submarine deal struck by Canberra, London and Washington.
Television cameras captured the diplomatic convoy arriving at Taiwan's Presidential Office early on Wednesday, but the group continues to maintain a low-profile.
Taiwan's 2021 National Defense Report, released on Tuesday, said the Chinese military was already capable of blockading the island during a conflict.
Taiwan's Foreign Ministry said it was facilitating the arrival of the delegation, whose trip has been arranged by the American Institute in Taiwan.
Taiwan's biennial defense report puts a figure on the military exchanges confirmed publicly by President Tsai Ing-wen late last month.
The former secretary of state was responding to recent comments by President Biden, who said the U.S.-China relationship was about competition and not conflict.
Images "detail the construction of a sophisticated weapons test range" that "incorporates a number of simulated U.S. Navy Carrier strike group vessels as targets," Maxar Technologies said.
The Chinese Communist Party publication said tensions could lead to "a life-and-death struggle" forcing the U.S. to sacrifice "the lives of Americans."
A notice sent from the Commerce Ministry advised citizens to stock up in case of emergency but did not clarify that they were referring to a COVID-19 lockdown.
Though Taiwan is self-ruled, China claims it as part of its territory and has been increasingly assertive in recent months about establishing its dominance.
"Foreign forces stationed on Taiwan" was left out of a U.S. military list of circumstances in which China "has indicated it would consider the use force."
The new legislation would give the Pentagon $3 billion in annual funds for the sole purpose of arming Taiwan—if Taipei can match that special figure itself.
China is on course to double its 2020 total of flights near the island, with its aircraft on pincer-like paths around the island.
The trip was not officially confirmed until the multinational group of EU lawmakers landed in Taipei on Wednesday morning.
"If anyone still tries to challenge the one-China principle...they will only suffer an even greater defeat," China's Foreign Ministry spokesperson said.
"...if any friends or other groups can help us...we're happy to have it, but we cannot completely depend on it," Taiwanese Defense Minister Chiu Kuo-cheng said.
A recent "Wall Street Journal" report into Taiwan's war preparations has sent ripples through Taiwan's social and political circles.
In her first interview with international media in nearly two years, the Taiwanese leader said she had "faith" in an American response if China were to attack.
Peter Dutton's comments on Beijing and Washington drew a hawkish response from Communist Party tabloid the Global Times.
The battery-powered lower-body suit could one day help soldiers lift weights of up to 220 pounds, according to a member of the team behind it.
Plans emerged as Taiwan Foreign Minister Joseph Wu made closely watched visits to Slovakia and the Czech Republic this week.
The episode, which aired late on Sunday in the United States, dropped shortly after Xi Jinping had given a lengthy speech about China at the United Nations.