Russia threatened several states with retaliation if they voted in favour of a resolution declaring Crimea's secession vote from the Ukraine invalid.
The US, UK and France want UN-sanctioned use of force should Syria fail to allow destruction of its chemical weapons, but Russia disagrees.
The UN Security Council has reached a deal on a draft resolution to renew the mandate of peacekeepers in the disputed territory of Western Sahara.
Kofi Annan's deputy has told the Security Council that the swift deployment of observers to Syria is needed despite risks and persistent violence.
Argentina is quietly reaching out to Iran, worrying key Western powers and Israel as they try to tighten Tehran's isolation over its nuclear program.
The Palestinians' initiative to seek UN recognition as a state faces an uphill struggle to secure the nine votes needed for approval.
North Korea and Iran appear to have been regularly exchanging ballistic missile technology in violation of United Nations sanctions.
The United Nations is investigating suspected arms transfers from Zimbabwe to Côte d'Ivoire's incumbent leader Laurent Gbagbo.
The UN Security Council unanimously imposed travel and asset sanctions on Libyan leader Moammar Gadaffi and close aides.
The United States on Friday vetoed a draft UN Security Council resolution condemning Israeli settlements on Palestinian land.