Photo via the website of China's Foreign Ministry

Those who attempt to challenge the one-China principle on the Taiwan question are making themselves enemies of the 1.4 billion Chinese people and will have to pay a heavy price for their moves, said Chinese State Councilor and Foreign Minister Wang Yi on Monday. 

Wang, who is on a visit to Germany, made the remarks when answering a question about Czech Senate Speaker Milos Vystrcil's recent visit to Taiwan. 

Calling the visit a provocation, Wang stressed that Taiwan is an inseparable part of China and China will not sit by idly.

Vystrcil is leading a delegation of about 90 people, including Prague Mayor Zdenek Hrib, to visit the southeast China island from August 30 to September 4 with a "trade mission." 

On Saturday, the Chinese embassy in the Czech Republic expressed strong opposition to the visit. 

The senate speaker is seriously interfering in China's internal affairs and infringing on China's national sovereignty and territorial integrity, said the embassy spokesperson, warning Vystrcil's move has violated the basic norms of international relations and bilateral political commitments. 
The spokesperson also urged the Czech side to abide by the one-China principle and take concrete actions to safeguard the overall situation of China-Czech relations.

Earlier, Chinese Ambassador to the Czech Republic Zhang Jianmin also warned of possible consequences as a result of the trip.

China-Czech ties have been challenged by certain politicians who violate the one-China principle and international rules, Zhang said in an interview with local newspaper Halo noviny. Such a behavior sacrifices the interests of Czech companies and people and harms the pragmatic cooperation between the two sides, he added.