My feeling is that the penny has dropped with Western leaders, but it takes time for the backstage discussions necessary for a harmonious announcememnt of heavy weapons donations. It's quite a big escalation. And it's good for it to look like a firm resolution. People have learned that Putin acts when he perceives the West to be divided. So I'm not disheartened by a short period of silence. Putin's next massacre will arrive any day now. It would be good to use that as a platform for a Nato escalation.
Zelensky always asks for more than he can get, in the expectation he'll be met halfway. He knew a no fly zone was impossible, but he kept asking for it, on and on and on, and he was given a decent supply of missiles which his people made excellent use of. Without the amazing success rate of those missiles, everyone would be talking about giving in.