A Russian charged with leading a Taliban attack against U.S. forces in Afghanistan has again pleaded not guilty.

Irek Hamidullin was arraigned on a new 15-count indictment Tuesday in U.S. District Court in Richmond. A five-day jury trial is scheduled to start July 27.

Hamidullin previously pleaded not guilty to 12 terrorism-related charges. Three additional counts of trying to kill or injure an American were added in a new indictment last week.

Hamidullin is the first military detainee from Afghanistan to be brought to the U.S. for trial. The Obama administration is trying to show that it can use the criminal court system to deal with terror suspects — a move criticized by some Republican lawmakers who believe such cases should be handled by military tribunals.