The Ukrainian side claimed that the Minsk agreements are just a piece of paper and they are not necessary for implementation. Therefore Russia could claim as well that there’s no need to fulfill these agreements. Or is it only the DPR-LPR that should fulfill them? If this agreement is optional, then could the DPR-LPR attack too?
Crimea returned to Russia after a referendum on the peninsula.
Recurring pro-Kremlin disinformation narrative about the annexation of Crimea, claiming that Crimea voted to rejoin Russia through a legal referendum.
Crimea is a part of Ukraine and was illegally annexed by Russia. In 2014, Russian troops obliged the parliament of Crimea to organise a referendum, which was illegitimate under international law, and then formally annexed the peninsula and brought it under Russian territorial control. The annexation has been condemned by the UNGA (see the resolution A/RES/68/262 on the territorial integrity of Ukraine).
No international body recognises the so-called referendum, announced on 27 February 2014 and held on 16 March 2014.
A year after the illegal annexation, Russian President Vladimir Putin admitted that the plan to annex Crimea was ordered weeks before the so-called referendum.
The European Union does not recognise Crimea's annexation and continues to condemn it as a violation of international law. EU sanctions continue to be in place against Russia as a consequence for the annexation. For the EU statement on the sixth anniversary of Crimea annexation see here.