Dec 15 (Reuters) - The hundreds of Russian drones hovering ominously over the Ukrainian battlefield owe their existence to an elastic, sanctions-evading supply chain that often runs through a shabby office above a Hong Kong marketplace, and sometimes through a yellow stucco home in suburban Florida.Among the most important suppliers to Russia's drone program has been a Hong Kong-based exporter, Asia Pacific Links Ltd, which, according to Russian customs and financial records, provided millions of dollars in parts, though never directly.Asia Pacific's owner, Anton Trofimov, is an expatriate Russian who graduated from a Chinese university and has other business interests in China as well as a company in Toronto, Canada, according to his LinkedIn profile and other corporate filings.In the seven months between March 1 and September 30, since Russia's February invasion, Asia Pacific increased its business sharply, exporting parts valued at about $5.2 million, up from about $2.3 million in the same period of 2021, making it iLogic's biggest supplier, according to Russian customs records.According to a record of iLogic's own bank receipts and payments seen by Reuters, iLogic works almost exclusively for the drone maker."