Netanyahu and the Israelis learned something very important about Trump after Trump's recent meeting with Russian officials at the White House: They learned that they cannot trust Trump, and we can be sure that they don't trust him and won't trust him.  That fundamental shift in how the Israelis perceive Trump will be the proverbial "elephant in the room"; everyone will try to play nice, and if Trump manages to stick to the script his advisers write for him, they might even pull it off. But the lack of trust will affect every aspect of the relationship not only between Netanyahu and Trump, but more radically between Israel and the United States.
The worst effect of Trump's recklessness with the Russians is that he didn't simply squander the trust and respect that the Israelis had for him personally; he's damaged the relationship between the two countries for a very long time, even after he leaves office.