KABUL/MOSCOW (Reuters) -A Russian-registered charter plane with six people on board disappeared from radar screens over Afghanistan a day earlier, Russian aviation authorities said on Sunday, after Afghan police said they had received reports of a crash. The plane was a charter ambulance flight travelling from Thailand’s Utapao Airport in Pattaya to Moscow via India and Uzbekistan on a French-made Dassault Aviation Falcon 10 jet manufactured in 1978, Russian aviation authorities said in a statement. About 25 minutes before the plane vanished from radar screens, the pilot warned that fuel was r…