Russia and Iran have signed an agreement to expand their military ties.

In remarks carried by Russian news agencies, Russian Defense Minister Sergei Shoigu said in Tehran Tuesday that the new agreement includes expanded counter-terrorism cooperation, exchanges of military personnel for training purposes and an understanding for each country's navy to more frequently use the other's ports.

Shoigu did not mention any prospective arms deals or the ongoing controversy over a Russian contract to deliver the S-300 air defense missile system to Iran. Russia signed a 2007 contract to sell Tehran the S-300 system, but the weaponry was never delivered amid strong objections by United States and Israel.