Moscow court denies appeal by jailed WSJ reporter Evan Gershkovich, extends detention to November

Gershkovich arrested in March, accused of espionage which he denies.
Latest appeal against pre-trial detention sent back to lower court on procedural grounds.
Detention extended until November 30, no trial date set yet.
US government calls charges baseless, says Gershkovich is wrongfully detained.
Gershkovich first US reporter jailed in Russia on espionage charges since 1986.