WARSAW, Poland—Polish Prime Minister Mateusz Morawiecki said that Western sanctions against Russia over its invasion of Ukraine aren’t having their intended impact, with the rebound of the Russian ruble proof that the existing measures are “not robust enough.” Morawiecki on Saturday met with EU Parliament President Roberta Metsola at a reception center near Warsaw for refugees fleeing the war in Ukraine. The Polish leader said that the recovery of Russia’s currency, which initially plummeted following the imposition of sanctions but which has since rebounded, is proof that the sanctions aren’t having their intended impact. “This means that all economic measures—microeconomic, macroeconomic, financial, budgetary, and monetary—have not worked as some politicians would have liked,” Morawiecki said. Morawiecki then called for “real sanctions” to be imposed on Russia, echoing remarks he made a day earlier, in which he urged the EU to press ahead with a “radical cut-off from Russian fossil fuels” and …