Former jailed dissident Natan Sharansky came out against the Obama administration in a Washington Post op-ed, chastising what he considers the White House’s concessions to Iran, which he attributed to America’s “tragic loss of moral self-confidence.”

In the opinion piece titled “When did America forget that it’s America?” published Friday, Sharansky contrasts the US’s engagement with the Soviet Union during the Cold War with Washington’s dealings with Iran in recent years.