As told by Ukraine’s side:

It has been almost five years since the signing of the Minsk Agreements, which represent the only existing conduit for the gradual de-escalation of this conflict. Increasing ceasefire violations and obstruction of monitoring suggest that de-escalation remains unlikely.
— Read on globalriskinsights.com/2019/01/prospects-for-de-escalating-the-conflict-in-eastern-ukraine/