The strike occurred late August 16 and was reportedly carried out with several X-22 missiles from a Russian Air Force Tu-22.
I do not yet see a Russian MoD statement about it, but Russian channels are reporting 300+ soldiers of the Armed Forces of Ukraine were killed.
Deputy head of the Office of the President of Ukraine Kyrylo Tymoshenko said: "Seven buildings of the recreation centre were destroyed and 15 summer houses were damaged." Some speculate the incident is a retaliation for recent sabotage in Crimea.