It's an Il-18 variant, indeed. NATO code name "Coot-A". It is sometimes also referred to as "Il-18D-36 Bizon".

Source: Wikimedia
There are not many news about today's incident. Other sources speak of 2 Turkish F-16. All sources suggest that more than 1 Russian aircraft has been intercepted.
Rumors suggest that the Russian aircraft headed towards Bulgarian airspace, after which the Turkish fighters ended their pursuit.
None of the involved countries has commented on the incident yet.
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