Turkey’s largest ever single naval contract, a US $3.5 billion deal with a German shipyard for the co-production of six submarines, is facing major delays and disputes over modality, Turkish officials and industry sources said.

“We are in talks with our German partners to iron out differences and put the program back on track,” a senior procurement official familiar with the program said.

The official admitted the program is facing delays, but declined to comment on the reasons behind them. […]