During a visit to Hawaii, Tsai said that applications had been made to buy new F-16 and M1 tanks.
"Beijing's long-standing interest in ultimately forcing Taiwan's reunification with the mainland and rejecting any attempt by Taiwan to declare independence has been the main driver of China's military modernization," the DIA said in a report.
Tsai said the weapons requested by Washington would "greatly improve our land and air capabilities, bolster military morale, and show the US involvement in Taiwan's defense."
In response, the Chinese Ministry of Defense said Beijing was "strongly opposed to US arms sales to Taiwan and US military contacts with Taiwan."
"The Taiwan issue is one of China's internal affairs, affecting China's core interests and the national attachment of the Chinese people ̵
"Such dangerous steps are not in the interest of either side."
Tensions in the Taiwan Strait have increased in recent years as Beijing tries to pressure Taiwan. What it fears is the growing support for independence on the planet self-governing island.
The following day, Xi called Taiwan's independence "a dead end" and encouraged the island to " a country, two "follow systems" model adopted in Hong Kong when it passed from British to Chinese control in 1997.
She gave a powerful tone on Wednesday, saying that "Taipei will" aggressively combat the infiltration to counteract the Chinese government's involvement in our society and economy and their interference in our internal affairs. "
"They continue to undermine Our democratic institutions are intensifying military tensions and worsening our international space, which has led to growing mistrust of the Taiwanese people and poses a fundamental challenge to the future of cross-strait relations," she said. "China's actions have underscored Taiwan's need to expand our self-defense and deterrent capabilities."
Sarah Faidell of CNN contributed to the coverage.