Three companies with strong links to Singapore are among seven firms blacklisted by the United States under fresh sanctions against Myanmar[:]...Pavo Trading Pte Ltd, Air Bagan Holdings Pte Ltd and Htoo Wood Products Pte Ltd...Air Bagan Ltd of Myanmar...'s chairman...Tay Za has "very, very strong links to the junta," said Sean Turnell, an economics professor who specialises in Myanmar at Australia's Macquarie University...Phone and email messages to Pavo Trading were not immediately returned..."We can't really comment right now," said Zaw Nay Oo, Air Bagan's corporate affairs manager...The website for Pavo Trading says it is a sister company of Htoo Group of Companies and was established in 1999. "The company's main interest lies in export of timber and timber products from Myanmar,".