That’s absolutely terrible. The CEO says it’s a premium airline but they would just abandon pax in the middle of a war? Caveat emptor.

Did you also try the TLV number? Call a few more times and push really hard, if the same result, buy whatever you can and claim it back. Record the calls if possible. Don’t bother with the idea to get to WAW and then use the rest of the ticket, that’s a waste of time. Just buy the TLV-NYC.

Also worth remembering that Israel has its own EC261 style law so you’d have better chances than usual and you could also sue in US once the dust has settled. Do NOT refund the ticket.