MOSCOW — The Russian defense minister, Sergei K. Shoigu, said Monday that 50 trucks and 25 armored vehicles had been delivered to the Syrian port of Latakia in recent days to help with the removal of the country’s chemical weapons stockpile, the latest sign of progress in that effort despite the grinding civil war.

Mr. Shoigu reported the equipment delivery as new signs emerged of fractures in the diplomatic effort to start peace talks next month. The Syrian opposition threatened to boycott the talks, scheduled for Jan. 22 in Geneva, if the government did not halt a relentless aerial assault on Aleppo, the contested northern city.

Opposition activists say hundreds of civilians have died in nine days of air attacks.

The Russian vehicle delivery, reported on the Kremlin’s website, was conveyed by Mr. Shoigu to President Vladimir V. Putin by a video link, in which the defense minister informed him it had been completed “to implement as soon as possible the transmission of equipment and supplies for the export of Syrian chemical weapons.”

The removal of the chemical arms, which Syria committed to dismantle under an international agreement reached in September following American threats of a military strike, poses an enormous security challenge.