TEHRAN, Young Journalists Club (YJC) – China said there were no economic pre-conditions.
Taiwan, claimed by China as its own, has formal relations now with only 19 countries, many of them poor nations in Central America and the Pacific like Belize and Nauru.
China says Taiwan is simply a wayward province with no right to state-to-state ties.
China and Taiwan have tried to poach each other's allies over the years, often dangling generous aid packages in front of developing nations, though Taipei struggles to compete with an increasingly powerful China.
Panama ended its long-standing relationship with Taiwan last year in a major diplomatic victory for China. The Vatican is possibly next on the list, as the Holy See and China edge closer to an accord on the appointment of bishops in China.
The news on the Dominican Republic switch, announced in both Beijing and Santo Domingo, drew strong and swift condemnation from Taiwan Foreign Minister Joseph Wu.
"President Danilo Medina of the Dominican Republic has ignored our long-term partnership, the wishes of the people of the Dominican Republic, and the years of development assistance provided by Taiwan, to accept false promises of investment and aid by China," Wu told reporters.
"(Taiwan) strongly condemns China's objectionable decision to use dollar diplomacy to convert Taiwan's diplomatic allies. Beijing's attempts at foreign policy have only served to drive a wedge between the people on both sides of the Taiwan Strait, erode mutual trust and further harm the feelings of the people of Taiwan."
A Taiwan Foreign Ministry official, speaking on condition of anonymity, told Reuters that, according to initial calculations, China dangled at least a $3.1 billion package of investments, financial assistance and low-interest loans for the Dominican Republic, which shares an island with Haiti to the west.
That included $400 million for a new freeway, $1.6 billion for infrastructure projects and $300 million for a new natural gas power plant.
"It was a cost that Taiwan could not match," the official said.
China's Foreign Ministry said the move was a political one with no economic pre-conditions, but that now they have established ties, China will "proactively promote mutually beneficial cooperation in all areas".
A person who answered the telephone at the Dominican Republic's Beijing representative office said it did not know about the situation and declined further comment.
China has stepped up the pressure on Taiwan since the 2016 election of Tsai Ing-wen, from the pro-independence Democratic Progressive Party, as president. Beijing fears she will push for Taiwan's formal independence, but Tsai says she wants to maintain the status quo.
The Dominican Republic had been a diplomatic ally of the Republic of China - Taiwan's official name - for 77 years, including when the government ruled all of China before being forced to Taiwan in 1949 after losing a civil war to the Communists.
Taiwan's presidential office said that despite the severe challenges, the government would not bow its head in pressure to Beijing, and vowed to do all it could to protect Taiwan's interests.
The Taiwan official said the Dominican Republic move was not unexpected.
"We've always known things were not looking rosy here," the official said.