Volkswagen workers will go on extended strikes on Monday, stepping up a bitter dispute with management over layoffs and what would be the first factory closures on German soil for Europe's largest carmaker,

Volkswagen workers ramped up pressure on its management with further strikes at the carmaker's German sites on Monday, as a fourth round of talks was set to begin in an increasingly bitter standoff over wage cuts.

Rolling strikes hit nine of auto giant Volkswagen's plants across Germany for the second time this month, as the Volkswagen workforce protests painful proposed cuts at Europe's largest carmaker. Monday's strikes ratchet up the pressure on management on the same day that the fourth round of collective bargaining negotiations over pay cuts and threatened factory closures got under way on Monday in Wolfsburg,

By Victoria Waldersee and Christina Amann WOLFSBURG, Germany (Reuters) - Volkswagen workers ramped up pressure on its management with further strikes at the carmaker's German sites on Monday, as a fourth round of talks was set to begin in an increasingly bitter standoff over wage cuts and plant closures.