As mentioned earlier, the US via Trump has effectively said to the rest of the world "If he pulls a knife, you pull a gun. If he sends one of yours to the hospital, you send one of his to the morgue! That's the Chicago way" to quote a phrase and now the rest of the world has to take a look and decide how willing they are to push when they now 100% know the US WILL respond to them, personally, via a Drone strike, anywhere they can and screw the consequences.
While it's not the "pretty" diplomacy of Real Politik, the "Chicago Way" method Trump has chosen has a diplomacy all of it's own.
However that is not the case. Soleimani didn't pulled a knife, not against the US directly but against its construct, ISIS. Neither has Iran.
Because WE (UK basically) created ISIS. We provide training, money, equipment to dozens of fanatical Sunni groups. We even provide them space to run propaganda on us. Thats not something new or shocking. Countless UK media reports for "helping" the "Assad opponents" over the years.
Countless times we heard of the Syrian Anti-Assad "Human Rights" organizations, which are 1 man band behind a computer in Britain. Literally.
Even this Monday nowhere on the UK media was the UNSC (at least the non "West" one") had discussion that the Douma chemical attack never happened.
The group of OPCW scientists on the ground never wrote a report because was nothing to report. Nothing took place there. A different group in their offices at the HQ of OPCW wrote the "report" which which USA, UK and France took as gospel and bomb Syria.
OUR politicians repeatedly lying, yet you (plural) still take their word as the absolute truth ignoring all facts.