A billboard carries a portrait of Mohsen Fakhrizadeh, an Iranian scientist linked to the country’s nuclear program who was killed by unknown assailants last month, at the site of his killing in Absard east of the capital, Tehran, Iran, Wednesday, Dec. 16, 2020. Iran’s supreme leader and the country’s president both warned America on Wednesday that the departure of President Donald Trump does not immediately mean better relations between the two nations. The billboard also shows other slain nuclear scientists. The Persian reads: «the site of ascension of martyred scientist Mohsen Fakhrizadeh to heaven.» (AP Photo/Vahid Salemi)