The arms deal, awaiting approval, has drawn scrutiny from Beijing.
The quake struck at 12:17 a.m. (1617 GMT Monday) at a depth of 9.7km. Its epicentre was in Chiayi County, approximately 200 kilometres south of Taipei.
Taiwan launched a five-day annual drill on Monday to test the island nation’s ability to respond to an invasion by China.
“Our government should find ways to overcome difficulties,” the union leader added.
The Taiwan government on Thursday defended its coastguard’s actions after two Chinese fishermen died in a speedboat crash near the Kinmen Islands
Mr Liu said that although Nigeria and China have diplomatic relations, Taiwan is probably one of the best role models for Nigeria to develop its non-oil economy.
“For aircraft and ships that entered our sea and air territory of 12 nautical miles, the national army will exercise the right to self-defence and counter-attack.”
The United States and Taiwan have announced that they will officially launch trade talks after agreeing on a mandate.
Ms Pelosi’s diplomatic support to Taipei infuriated China, prompting it to hold live-fire military drills in the waters off Taiwan.
After her visit to Taiwan, speaker of the U.S. House of Representatives Nancy Pelosi flew on to the next stop of her Asia trip in South Korea on Wednesday.
