Not dumb enough? Careful, or someone might call out your argument for being that of a "Putin apologist".
I doubt it. My record on Putin is pretty clear and harsh, but that doesn't mean I think Putin is some sort of idiot or fanatic or ideologue.
Just as a cornered animal will fight back, a man with nothing left to lose will use whatever is at his disposal--dumb or not.
Some supporters of Ukraine have complained about the Western approach to arming Ukraine (e.g., "too slow," "give more now," "faster".) and the Ukrainian government certainly wanted (and wants) more weapons and weapons systems, but the US/NATO/Western tactic of expanding the roster of weapons one weapon system at a time has made Russia look a bit silly complaining about each one like it is an outrage: Javelins, 155 mm Howitzers, Soviet-style tanks, anti-aircraft systems, Soviet-type aircraft, HIMARS rocket artillery, self-propelled 155 mm artillery, mine clearing equipment, Patriot batteries, Strykers, Humvees, Bradley fighting vehicles, (and other such vehicles), Leopard tanks, Abrams tanks, medium-range cruise missiles, and most recently F-16 fighter jets. Not all of these have come from the US and many countries have provided various kinds of weapons.
With each new type being discussed between the Ukrainians and western nations, the Russians have gnashed their teeth and rattled their swords threatening retaliation and talking of "red lines", but nothing ever comes of any. Sure the Russians have claimed some (obviously) pre-planned attacks that would happen shortly after some "event" (announcement or initial delivery) was "retaliation", the military analysts make it clear that Russia was going to make those moves with or without the new batch of Western weapons.
The Western allies of Ukraine have frog-boiled Russia on military equipment, system after system yields the usual protest and then back to "normal". In the meantime, what was once an "outrage" to the Russians (provision of heavy artillery) is just now the way it is and Ukraine's primary heavy artillery is NATO standard 155 mm guns rather than the Soviet standard 152 mm of Ukraine's army at the beginning of last year.
TL;DR version: Putin/Russia has claimed to be outraged and portrayed as "cornered" at least a dozen times before the F-16s and all Putin did was to shout loudly for a few days and then start complaining about the next possible "escalation".