Actually these "reservists" are in fact former conscripts, who, when drafted, spend one year on active duty, and have what amounts to (given Russian life expectancy) a life time obligation, without pay, or refresher training, to report if called up.
The present situation in Russia is roughly, very roughly I will grant, as if the US Army did not have significant organized reserves, or the Army National Guard, in 1990, and called up former Vietnam era conscripts, who had not been paid or trained, since they left the Army, for service in Desert Storm. Imagine the reaction of guys who had already been forced to serve once, perhaps in combat, being called up again, while the guys who got deferments, or went to Canada, where exempt.
I think your after Vietnam analogy is missing an important difference. I know that after his enlistment which included Gulf War 1 (1991) was finished, my son continued in the paid Reserves. This included a monthly meeting, and 2 weeks training each year. After several years his Reserve commander urged him to reinlist because he wanted my son for a specific job, which he did. He is now retiring after more than 20 years.
Does Reserve service still continue in the US as he lived it, or is there some other US system now?