A canary is sensitive to coal gases. When it dies, the miners realize that they must take action or die themselves. The Middle East and Ukraine are our canaries. We must take action or the same coal gases that are killing our fellow human beings in those countries will kill us as well.
What coal dust?
The "coal dust" that is poisoning these and other small countries (and threatening the quality of life in America) is generated by our plutocratic form of government. The few very wealthy Americans who dominate our elected and appointed civil officers are using their wealth to control US domestic and foreign policies. The militaristic policies that serve their needs are not in the best interests of ordinary Americans. Instead of serving our best interests, they are eroding our freedom and quality of life at home and creating hatred, terrorism and civil wars abroad.
Why mention Ukraine especially?
First and most important, Ukraine's geographical and geopolitical positions make it the intervention most likely to lead us into a nuclear conflict.
Second, it is still "early days" in Ukraine, We can still back off from or avoid some of the mistakes we have become committed to in the Middle East. For example, we can still withdraw our support from the authoritarian Kiev regime in Ukraine.