The Bosnian Serbs received volunteers from Orthodox Christian countries such as Russia and Greece. These included hundreds of Russians, around 100 Greeks, and some Ukrainians and Romanians. Apart from the Orthodox volunteers, Polish volunteers also participated on the Serbian side. One Japanese volunteer is documented. According to ICTY documents, volunteers from Russia, Greece, and Romania fighting for the Army of Republika Srpska (VRS) numbered between at least 500 to more than 1,500. Other estimate vary depending on sources, with some estimate from 529 and 614, other claim that number is well over 1,000 volunteers from Orthodox countries. Michael Innes writes that in April 1994 the VRS consisted of 100,000 men, out of whom 1,000–1,500 were mercenaries from Russia, Ukraine and Bulgaria. Journalist Ljiljana Bulatović claimed that 49 Russians were killed in the war. Mikhail Polikarpov, a historian and participant in the war, numbered Russian soldiers at the hundreds, about 40 of whom died and 20 injured. These Greek and Russian mercenaries fought for some 200 German marks monthly.