A list of major developments this week as part of diplomatic efforts to end the Syrian crisis:

— April 9 — Syrian Foreign Minister Walid Moallem arrives in Moscow for talks beginning Tuesday.

— April 10 — Deadline for Syrian troops to begin withdrawing from population centers under a cease-fire plan brokered by U.N. and Arab League envoy Kofi Annan.

— April 10 — Syrian and Russian foreign ministers scheduled to hold news conference in Moscow.

— April 10 — Annan to visit Syrian refugees in Turkey.

— April 11 — Annan expected in Tehran to discuss Syrian crisis.

— April 12 — 6 a.m. deadline for total cease-fire under Annan agreement.