In May 2013, Thein Sein became the first Myanmar president to visit the White House in 47 years; the last Burmese leader to visit the White House was Ne Win in September 1966. President Barack Obama praised the former general for political and economic reforms, and the cessation of tensions between Myanmar and the United States. Political activists objected to the visit due to concerns over human rights abuses in Myanmar but Obama assured Thein Sein that Myanmar will receive US support. The two leaders discussed to release more political prisoners, the institutionalisation of political reform and rule of law, and ending ethnic conflict in Myanmar—the two governments agreed to sign a bilateral trade and investment framework agreement on 21 May 2013.
When was the most prior visit from a Burmese representative to the  United States prior to 2010 ? 
the last Burmese leader to visit the White House was Ne Win in September 1966