Tensions began with Russia's decision four days ago to limit the number of German officials working Russia to 350.
Germany has today responded by ordering the closure of four out of the five Russian consulates operating in Germany, leaving only the Berlin embassy operative.
Poland has been highly critical of German foreign policy - a situation described as "the feud at the heart of Europe" by the Financial Times. However, these latest events would suggest that German-Russian relations are worsening.
Sources: PAP, Reuters, Financial Times