Secretary of State Hillary Clinton will hold bilateral talks with 'senior Russian officials' in Moscow this week on the margins of a meeting of Quartet nations on Mideast peace, the State Department announced Monday. Clinton will be in Moscow March 18 and 19 for talks with UN Secretary General Ban Ki-moon, Russian Foreign Minister Sergei Lavrov, European High Representative Catherine Ashton, as well as Quartet Representative Tony Blair, said State Department spokesman Philip Crowley. Clinton also will discuss a Russian-US agenda on a successor agreement to the START weapons treaty, cooperation on nonproliferation, counterterrorism, and regional security issues, the official said. The Middle East diplomatic Quartet -- the European Union, the United States, Russia and the United Nations -- meet for a ministerial session on March 19 to discuss Israel's controversial plan to build 1,600 new settler homes in predominantly Arab east Jerusalem and other matters. 