Russian President Vladimir Putin told German Chancellor Angela Merkel in talks by phone Monday that Ukraine needs constitutional reform.

Russian President Vladimir Putin told German Chancellor Angela Merkel in talks by phone Monday that Ukraine needs constitutional reform.

"Discussing various aspects of the situation in Ukraine... Putin stressed the importance of holding constitutional reforms" in Ukraine, the Kremlin said in a statement.

Russia has called for Western powers to urge Ukraine to change its constitution to allow greater autonomy for regions in the south and east where ethnic Russians and Russian-speakers are concentrated.

The Kremlin said that Merkel and Putin also discussed Moldova's largely Russian-speaking breakaway region of Transdniestr, which lies on part of Moldova's border with Ukraine.

Putin raised "the need to take effective measures aimed at lifting an effective blockade from the outside of this region," it said.

Moscow has complained that Transdniestr is being blockaded by Moldova and Ukraine.

Russian Foreign Minister Sergei Lavrov said Saturday that "Chisinau and the new Ukrainian authorities have practically organized a blockade" of Transdniestr.

"What's more, the European Union and, as I understand it, the United States, encourage such a line," Lavrov added.