  The dwarf spheroidal galaxy Ursa Major II (UMaII) is believed to be one of
the most dark-matter dominated systems among the Milky Way satellites and
represents a suitable target for indirect dark matter (DM) searches. The MAGIC
telescopes carried out a deep observation campaign on UMaII between 2014 and
2016, collecting almost one hundred hours of good-quality data. This campaign
enlarges the pool of DM targets observed at very high energy (E$\gtrsim$50GeV)
in search for signatures of dark matter annihilation in the wide mass range
between $\sim$100 GeV and $\sim$100 TeV. To this end, the data are analyzed
with the full likelihood analysis, a method based on the exploitation of the
spectral information of the recorded events for an optimal sensitivity to the
explored dark matter models. We obtain constraints on the annihilation
cross-section for different channels that are among the most robust and
stringent achieved so far at the TeV mass scale from observations of dwarf
satellite galaxies.
