Two high-profile US citizens imprisoned in Russia were on their way back home on Thursday after being freed in exchange for a convicted Russian murderer sitting in a German jail and others in a major prisoner exchange involving 26 detainees and several countries. The exchange, announced on Thursday by Turkey’s National Intelligence Organization (MIT) and later confirmed by US President Joe Biden, included Wall Street Journal reporter Evan Gershkovich and former US marine Paul Whelan. The prisoner exchange took place at the airport in the Turkish capital Ankara, MIT said. It also included Germa…