Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Erdogan Threatens Deepening Russian Ties Unless US Unfreezes Jet Sale Dorian Jones ISTANBUL - Turkish President Recep Tayyip Erdogan is threatening to deepen military ties with Moscow unless the United States lifts its embargo on the sale of a key fighter jet. The warning comes ahead of next week's planned meeting between Erodgan and President Donald Trump. .