They did military drills on the border every year: https://www.google.com/search?q=russian+military+drill+ukraine+border&tbs=cdr%3A1%2Ccd_min%3A1%2F1%2F2015%2C

They did military drills on the border every year: https://www.google.com/search?q=russian+military+drill+ukraine+border&tbs=cdr%3A1%2Ccd_min%3A1%2F1%2F2015%2Ccd_max%3A1%2F1%2F2020&tbm= https://www.google.com/search?q=russian+military+drill+ukrai...