TASS is referring to an OSCE report, OSCE is the Euro-American organization in charge of monitoring the ceasefire. They have been accused of collaborating with Ukraine and arrested after the war started but their reports before show ceasefire violations by Ukraine.

https://www.osce.org/special-monitoring-mission-to-ukraine/512683

Zelensky has said that he never intended to follow the Minsk ceasefire and said so to Der Spiegel. Other Euorpean leaders like Angela Merkel and Francois Hollande have made it clear they used Minsk just to buy Ukraine time.