At least 33 Turkish soldiers have died in a Syrian government attack in opposition-held north-western Syria, in a major escalation of the conflict.
Turkey, which backs the opposition, says it hit 200 government targets in response.
Russia, Syria's key military ally, says Turkish troops were attacked in Idlib province by Syrian forces while operating alongside jihadist fighters.
The EU has warned the crisis could escalate further.
Russian and Turkish officials are due to meet at the Turkish foreign ministry.
Russia also says top Russian and US military officials have discussed the situation in Idlib.
Russia denies its own forces were involved in the fighting in the Balyun area.
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