Just three days before US President-elect Donald Trump returns to the White House, Russia and Iran have finally signed a “comprehensive partnership agreement,” a deal that had been in the works for months.

Russian and Iranian officials say the “comprehensive strategic partnership treaty” covers all areas -– from trade and military cooperation to science, education and culture. The 20-year treaty could be extended further.

Russian President Vladimir Putin and his Iranian counterpart Masoud Pezeshkian deepened military ties between their countries on Friday by signing a 20-year strategic partnership that is likely to worry the West.

Russian President Vladimir Putin and Iranian President Masud Pezeshkian today signed a comprehensive strategic partnership agreement, which also includes security and defense cooperation. The signing ceremony took place in the Kremlin's Malachite Hall after several hours of negotiations between delegations from the two countries.