Russian ITAR-TASS informing about an An-26 being shot down by a missile.
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But it wasn't an An-26.
The report you mentioned is about another plane allegedly shot down on Monday in the Donetsk region:
Contact lost with crew of An-26 military transport plane in Luhansk region
Be aware that the separatists claim to have shot down a number of Ukrainian military aircraft in the past weeks: Including at least seven Su-25 attack jets, three Su-24 attackers, one Su-27 fighter jet, an Il-76 military transport aircraft, and at least 17 Mi-8 and Mi-24 military helicopters.