Nursultan Nazarbayev appealed to Russian and Belarusian counterparts to take preparation of the Eurasian Economic Union agreement seriously and not to make hasty decisions.
More than 30 people were killed in a "criminal" blaze in Ukraine's southern city of Odessa, as violence spread across the country during the bloodiest day since Kiev's Western-backed government took power.
Ten soldiers and civilian staff at a Russian military munitions depot burnt to death while fleeing a fire that sparked a series of explosions, the defence ministry said.
Russia's energy giant Gazprom warned on Tuesday that new Western sanctions aimed at punishing the Kremlin for its perceived attempts to destabilise Ukraine could both hurt its stock price and leave Europe without crucial gas supplies.
In his speech at Moscow State University President Nazarbayev said that Ukraine would benefit from cooperation with Russian and Kazakhstan amid any scenario.
Kazakhstan's President Nazarbayev has given a speech at the Lomonosov Moscow State University in which he stated that rebirth of the Soviet Union was impossible.
The mayor of Kharkiv, who was left in critical condition after being shot in the back by an unknown assailant, has been flown to Israel for treatment, local officials said.
The United States has been moving cautiously in slapping sanctions on Russia over the Ukraine crisis, keen to keep its EU allies on board and avoid exposing fault lines within the European bloc, analysts say.
Eight people were killed on Sunday when a fire ravaged a drug rehab centre in Russia's Altai region, investigators said, raising fresh questions about security standards in the country's medical facilities.
According to the Russian Foreign Minister Sergey Lavrov, drawing parallels between Crimea, which was declared a Russian territory as a result of a referendum, and Kazakhstan is completely inept.
The Group of Seven rich countries agreed Saturday to impose new sanctions on Russia over the crisis in Ukraine, after Kiev accused Moscow of seeking to trigger a "third world war".
US President Barack Obama accused Russia on Thursday of failing to respect an agreement to defuse the crisis in Ukraine, the latest salvo in the Cold War-like duel between Washington and Moscow over the future of the ex-Soviet nation.
Four French fighter jets will join NATO air patrols over the Baltics starting on Sunday, France's chief of defense staff said Wednesday during a visit to Washington.
During a working visit to St. Petersburg, the Senate Speaker of Kazakhstan Kassym-Jomart Tokayev emphasized Kazakhstan’s grave concerns regarding the situation in Ukraine.