NATO'S secretary general has said he doubted Moscow's explanation that Russian weekend airspace violations of Nato-ally Turkey near Syria were a mistake and called on Russia not to repeat such incursions.
Following Russia's unexpected move to launch air strikes in Syria last week, Jens Stoltenberg said Nato also had reports of a substantial Russian military build-up there, including ground troops and ships in the eastern Mediterranean.
"I will not speculate on the motives ... but this does not look like an accident and we have seen two of them," Mr Stoltenberg said of the air incursions in the Hatay region. He noted that they "lasted for a long time."
The incidents, which Nato has described as "extremely dangerous" and "unacceptable", underscore the risks of an international escalation of the Syrian civil war, as Russian and US planes fly combat missions over the same country for the first time since the Second World War.
The Russian Defence Ministry said an SU-30 fighter aircraft had entered Turkish airspace along the border with Syria "for a few seconds" on Saturday, a mistake caused by bad weather.
Nato says a plane also entered Turkish airspace on Sunday, an assertion Russia says it is looking into.
A US official said the incursions lasted more than a few seconds and described Moscow's assertion that the incursions were an accident as "far-fetched".
Mr Stoltenberg said the US-led alliance, of which Turkey has the second-largest military, had not received "any real explanation" from Russia of the air incursions. He said he had not had any direct contact with Moscow but Nato has discussed the possibility of using its military lines of communication with Russia.
The US, which is leading the coalition fighting Islamic State in Syria and Iraq, wants to avoid being drawn into a proxy war with Russia, which is defending its ally Syrian President Bashar al-Assad.
Russian President Vladimir Putin has said he would not put ground forces in Syria, which is fighting a civil conflict that has killed some 250,000 people. However, Mr Stoltenberg said there was a large presence of Russian forces in Syria.
"I can confirm that we have seen a substantial build-up of Russian forces in Syria: air forces, air defences, but also ground troops in connection with the air base they have, and we also see an increased naval presence," Mr Stoltenberg said.
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