On November 19th, President Putin will stand shoulder to shoulder with President Erdogan during a ceremony to celebrate the completion of the first string of Turk Stream. The subsea gas pipeline will transfer 15.75 bcm directly from mainland Russia to Turkey. The capacity will double after the second string is completed. The pipeline will be operational at the end of 2019. Despite several setbacks, mutual interests concerning security and trade have ensured the strengthening of cooperation between Russia and Turkey in the face of opposition from…