Elias Groll: Putin lurks on the sidelines as Greek economic crisis heads down to the wire
The main players in Greece's increasingly bitter fight with its European creditors are Greek Prime Minister Alexis Tsipras and German Chancellor Angela Merkel, who has consistently demanded that Athens implement hard-hitting austerity measures if it wants a bailout. But in the background, hoping to exploit a geopolitical opening, waits Russian President Vladimir Putin.