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Carter: Russia must soon meet again with US to talk about Syria flight conflicts

  • US Secretary of Defense Ashton Carter, left, shakes hands with a US Marine, next to Spain's Defense Minister Pedro Morenes, center, during their visit at Moron Airbase, near Seville, Spain, Tuesday, Oct. 6, 2015. Carter is on a weeklong trip to Europe, including stops in Spain, Italy and London, and will also attend the NATO meeting, which is expected to focus on Russia's recent launch of military airstrikes in Syria. (AP Photo/Laura Leon)

    US Secretary of Defense Ashton Carter, left, shakes hands with a US Marine, next to Spain's Defense Minister Pedro Morenes, center, during their visit at Moron Airbase, near Seville, Spain, Tuesday, Oct. 6, 2015. Carter is on a weeklong trip to Europe, including stops in Spain, Italy and London, and will also attend the NATO meeting, which is expected to focus on Russia's recent launch of military airstrikes in Syria. (AP Photo/Laura Leon)  (The Associated Press)

  • US Secretary of Defense Ashton Carter, center, and Spain's Defense Minister Pedro Morenes, right, walk together during their visit at Moron Airbase, near Seville, Spain, Tuesday, Oct. 6, 2015. Carter is on a weeklong trip to Europe, including stops in Spain, Italy and London, and will also attend the NATO meeting, which is expected to focus on Russia's recent launch of military airstrikes in Syria. (AP Photo/Laura Leon)

    US Secretary of Defense Ashton Carter, center, and Spain's Defense Minister Pedro Morenes, right, walk together during their visit at Moron Airbase, near Seville, Spain, Tuesday, Oct. 6, 2015. Carter is on a weeklong trip to Europe, including stops in Spain, Italy and London, and will also attend the NATO meeting, which is expected to focus on Russia's recent launch of military airstrikes in Syria. (AP Photo/Laura Leon)  (The Associated Press)

  • US Secretary of Defense Ashton Carter and Spain's Defense Minister Pedro Morenes, right, walk together during their visit at Moron Airbase, near Seville, Spain, Tuesday, Oct. 6, 2015. Carter is on a weeklong trip to Europe, including stops in Spain, Italy and London, and will also attend the NATO meeting, which is expected to focus on Russia's recent launch of military airstrikes in Syria. (AP Photo/Laura Leon)

    US Secretary of Defense Ashton Carter and Spain's Defense Minister Pedro Morenes, right, walk together during their visit at Moron Airbase, near Seville, Spain, Tuesday, Oct. 6, 2015. Carter is on a weeklong trip to Europe, including stops in Spain, Italy and London, and will also attend the NATO meeting, which is expected to focus on Russia's recent launch of military airstrikes in Syria. (AP Photo/Laura Leon)  (The Associated Press)

The U.S. defense secretary says Russian leaders need to contact the Pentagon right away to talk about Moscow's military activities in Syria.

Defense Secretary Ash Carter says the U.S. is waiting for a second meeting with Russia on how to avoid any accidents or miscalculations in the increasingly crowded skies over Syria.

U.S. and Russian officials talked by video conference last week. Then at least one Russian warplane violated Turkey's airspace over the weekend. NATO has denounced Russia for "irresponsible behavior."

Speaking at an air base in Spain, Carter said Tuesday that Russia's failure to respond to the U.S. meeting request may be "a further sign of their strategic confusion."

A U.S.-led coalition has been conducting airstrikes on Islamic State militants in Syria. Russia began airstrikes there last week.