Yes, a war would affect all of Europe and us, which is why wise heads who are not hawks i.e. Obama have done everything they can to rein in the war hawks and prevent it. But there are hawks who want a war with Russia
As the Spiegel Online reported
"Dangerous Propaganda: Network Close To NATO Military Leader Fueled Ukraine Conflict
Working with dubious sourcing, a group close to NATO's chief military commander Philip Breedlove sought to secure weapons deliveries for Ukraine, a trove of newly released emails revealed. The efforts served to intensify the conflict between the West and Russia.
...
The newly leaked emails reveal a clandestine network of Western agitators around the NATO military chief, whose presence fueled the conflict in Ukraine. Many allies found in Breedlove's alarmist public statements about alleged large Russian troop movements cause for concern early on. Earlier this year, the general was assuring the world that US European Command was "deterring Russia now and preparing to fight and win if necessary."
The emails document for the first time the questionable sources from whom Breedlove was getting his information. He had exaggerated Russian activities in eastern Ukraine with the overt goal of delivering weapons to Kiev.
The general and his likeminded colleagues perceived US President Barack Obama, the commander-in-chief of all American forces, as well as German Chancellor Angela Merkel as obstacles. Obama and Merkel were being "politically naive & counter-productive" in their calls for de-escalation, according to Phillip Karber, a central figure in Breedlove's network who was feeding information from Ukraine to the general.
"I think POTUS sees us as a threat that must be minimized,... ie do not get me into a war????" Breedlove wrote in one email, using the acronym for the president of the United States. How could Obama be persuaded to be more "engaged" in the conflict in Ukraine read: deliver weapons Breedlove had asked former Secretary of State Colin Powell."
www.spiegel.de/international/world/breedlove-network-sought-weapons-deliveries-for-ukraine-a-1104837.html
Trump is with Obama and is against all of this and has said that he will not be hiring lots and lots of the people who got the US into all these messes across the world.