The recovery of the Russian ruble indicates that the sanctions on Moscow are not serving their purpose, Polish Prime Minister Mateusz Morawiecki said on Saturday. A large number of states, including EU members, imposed restrictions on Russia after it attacked Ukraine in late February.

“I must say this very clearly: the sanctions we have imposed so far don’t work. The best evidence is the ruble exchange rate,” Morawiecki said on Saturday.

“The ruble exchange rate, this litmus test, has returned to the level it was before the Russian aggression against Ukraine. What does it mean? It means that all economic, financial, budgetary, and monetary measures have not worked as some leaders wished. It needs to be said very loudly,” he added, speaking at a center for Ukrainian refugees in Otwock near Warsaw.

Poland has advocated for tougher sanctions against Russia over its actions in Ukraine.

Earlier this week, the prime minister said that “The sanctions are supposed to stop Putin. If they haven’t, it means they are not robust enough!”