The s-300 system is fine but no match for modern air forces like the Israel's and the West . The much-vaunted requires even more intelligence and countermeasures if you need to defeat it. It won't be easy. The US has a few S-300's on hand, so I would expect any countermeasures to also be in Israel's capability.
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Alleged assailant behind officer's stabbing in north to remain in custody for 4 more days (Haaretz)
from the article: Lebanon warns UN: Israel planning to attack us