Russia's air force hit 86 "terrorist" targets in Syria in the past 24 hours, the defence ministry said Tuesday, in the highest one-day tally since it launched the bombing campaign on September 30.

"In the last 24 hours, Su-34, Su-24M and Su-25SM planes carried out 88 sorties against 86 terrorist infrastructure targets in the provinces of Raqa, Hama, Idlib, Latakia and Aleppo,"  defence ministry spokesman Igor Konashenkov told Russian news agencies.