Poland calls on EU to tighten sanctions against Russia

WARSAW (Reuters) - Polish President Bronislaw Komorowski called on the European Union on Monday to consider imposing tougher sanctions on Russia over an escalation of hostilities in Ukraine.

Pro-Russian separatists, backed by what NATO says is the direct participation of Russian troops, have launched an offensive in eastern and south-eastern Ukraine. Kiev said on Saturday 30 civilians had been killed in shelling of Mariupol, a city on the Sea of Azov.