Volkswagen AG’s powerful labor unions vowed to block the manufacturer’s plan to build a 1.3 billion-euro ($1.4 billion) factory in Turkey until violence triggered by the country’s cross-border offensive in northern Syria has stopped.

VW’s global works council chief and supervisory board member Bernd Osterloh said in remarks published in a staff newspaper seen by Bloomberg: “I want to say very clearly: the labor representatives repudiate approval as long as Turkey tries to reach its political goals with war and force”.

The world’s largest automaker put the prject on hold last month after tensions escalated following the withdrawal of U.S. troops from Syria. The U.S. move opened the way for Turkish forces to cross into northeastern Syria, forcing back Kurdish militants who controlled the border area.

The factory would be capable of building around 300,000 cars a year and provide a base for VW’s expansion in Turkey and the Middle East. The project would mark a milestone for the country in attracting foreign investment after a shaky economic period following a recession.

VW is concerned about the political situation and is monitoring developments, Chief Financial Officer Frank Witter told reporters last week. There’s no immediate time pressure to seek alternatives and capacity can be added at existing sites in Slovakia and elsewhere, he said.

In the published remarks, Osterloh said VW guidelines on co-determination and social engagement at its plants require “an environment of stability and reliability.”

The supervisory board is scheduled to meet Nov. 15 for the annual review of the manufacturer’s 5-year spending plans, which include capital allocation for its factories across all regions.