radar and electronic warfare and refueling and on and on
NATO is sending radar intel to Ukraine too - is NATO waging war on Russia? By international law, I would say not.
Russia is also sending satellite into to Iran. Also not an act of war.
It seems quite important to me that there is a consensus on what constitutes an act of war. Otherwise everything becomes a potential act of war, no meaningful limits or red lines people know not to cross, with corresponding escalation risks.
Well yes and not - but that is how international law works. As an analogy, Russia is not attacking tanks heading through the EU to Ukraine, before they pass the border into Ukraine.
There has to be a consensus of what constitutes a legal target. Or the whole world would be anarchy.