(QHA) -

UN Secretary-General Ban Ki-moon is urging an immediate resumption of "constructive dialogue" to resolve the crisis in Ukraine.

UN spokesman Stephane Dujarric said Ban has intensified his diplomatic efforts to reduce tensions and has had high-level contacts with all of the main parties involved.

The UN Security Council has announced that it will hold a public meeting on Ukraine on March 19 to hear briefings by UN Deputy Secretary-General Jan Eliasson and UN Assistant Secretary-General for Human Rights Ivan Simonovic on their recent visits to Ukraine.

On March 15, the eve of the Crimean referendum, Russia vetoed a U.S.-sponsored resolution that would have declared that vote illegal.