Are European sanctions on Russia working?

The conflict in eastern Ukraine is often called Europe’s forgotten war.
Separatists backed by Russia have been battling the Ukrainian army since 2014.
Thousands of people have been killed, and 1.5 million Ukrainians have been displaced.
European leaders say Russia has failed to implement the ceasefire deal it signed with Ukraine in 2015.
German Chancellor Angela Merkel says the EU has no choice but to extend sanctions against Russia’s energy, financial and arms sectors until next January.
It follows worsening relations with Russia.
Moscow is accused of ordering a murder in Berlin and conducting cyberattacks on the German government.
So, are the sanctions working?