Sergey Lavrov

Russia says its planes are carrying military goods to Syria

Russia has backed Syrian President Bashar Assad throughout the country's 4½-year civil war, providing weapons and military experts to train Syria's army to use them.

Lavrov on Thursday once again confirmed that Russia has military personnel in Syria for training purposes, but said nothing about reported deployments of additional troops.

Russian foreign minister to join nuclear talks

He will meet there with U.S. Secretary of State John Kerry in an attempt to resolve disputes that have forced an extension of the negotiations past the June 30 deadline.

Lavrov is to arrive Tuesday, the day that Iranian Foreign Minister Mohammad Javad Zarif returns to Vienna.

As Zarif flew home Sunday for consultations on how to proceed at the talks, a U.S. official confirmed that negotiators will miss a June 30 target date for a deal, aimed at limiting Tehran's nuclear program in exchange for sanctions relief.