The Sept.5 ceasefire is largely holding though some fighting has continued in places including the rebel stronghold of Donetsk.
"The ceasefire is taking shape, though of course not without problems. Monitoring mechanisms have been introduced, talks between Russia, the European Union and Ukraine have started, gas talks have restarted," Lavrov said.
Western countries say thousands of Russian troops have fought in Ukraine and accuse Russia of sending weapons, including a surface-to-air missile used to shoot down a Malaysian airliner over rebel-held territory in July. Moscow denies participating in the conflict or arming the rebels.
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Lavrov also repeated Russian criticism of the U.S.-led air campaign against Islamic State fighters in Syria, saying Washington was guilty of a "double standard" for refusing to cooperate with Syrian president Bashar al-Assad, a Russian ally.
Lavrov said that despite the Western sanctions, Russia did not feel isolated on the world stage. Moscow has responded to the sanctions by banning imports of most food from Western countries.
"We feel no isolation. But, having said that, I want to emphasise in particular that we do not want to go to extremes and abandon the European and American directions in our foreign economic cooperation," Lavrov said.
"We have no desire to continue a sanctions war, trading blows," Lavrov also said. "First of all, it is important that our partners understand the futility of ultimatums and threats."