If these Greek debt negotiations go wrong, and positions become so entrenched and tempers unchecked that the madness of an outright default prevails, or even looks very likely, financial markets across the eurozone and the entire world could endure a Lehman-style systemic lurch. That would seriously damage the still-fragile global economic recovery. This Russia angle, the cosying-up by Syriza to Moscow, at a time when East-West relations are at a post-Cold War low, will add additional edge and potential nastiness to already complex and fraught negotiations that we all desperately need to go right.