The London battle between Ukraine’s biggest bank and an Oligarch with his own private army –

When investigators from corporate consultant Kroll turned up at Privatbank’s headquarters in Dnipro, Ukraine, they were told to come back later when the office would be quieter. They had dinner and waited for the phone to ring, but by 11pm gave up and went back unannounced.

It was the latest twist in a legal battle that involves a billionaire who funded a private army to fight Russian-backed forces; bizarre deals that include the alleged purchase of over 126,000 tons of concentrated apple juice; and ultimately the bail-out of Ukraine’s biggest lender.

When the senior Kroll investigators, who had been commissioned by Ukraine’s central bank to do a forensic audit of Privatbank, returned to the…