Pavel Ivlev , a tax lawyer who went along as their attorney , later explained that officials had illegally interrogated him and threatened to arrest him .
In preparing the case , the government called in Yukos employees for questioning .
Pavel Ivlev , a tax lawyer who went along as Yukos ' attorney , later explained that officials had illegally interrogated him and threatened to arrest him .
In preparing the case , the government called in Yukos employees for questioning .