Some German politicians have requested that any moves to approve a tank upgrade deal be halted. Turkish-led forces began an assault in Syria’s north-west on Saturday.
The row comes just weeks after the two countries’ foreign ministers vowed to improve bilateral relations. Relations between the two Nato members have soured dramatically in recent years.
Reports on Friday suggested Berlin was moving to approve a request from Turkey for German arms manufacturer Rheinmetall to retrofit Leopard 2 models to better protect them from explosives.