Russia's defences could be 'more fragile than thought', western officials have warned amid growing signs that Ukraine's counter-offensive has begun. Ukrainian forces have advanced in Novodonetsk by up to five or six kilometres, it has emerged. Officials claim 'fierce battles are going on' for control of the settlement.American and European military officials advising Kyiv have claimed that Kremlin defensive lines may be fragile, an insider told The Economist today. Semyon Pegov, a prominent Kremlin-affiliated 'milblogger', confirmed that Ukraine had 'some success' in an attack in Novoselivka-Ugledar and claimed updates from the Russian-controlled region were 'more and more alarming every hour'....