U.S. Secretary of State John Kerry seeks common ground in Russia on Syria, Ukraine

U.S. Secretary of State John Kerry called Tuesday for the United States and Russia to find "common ground" on contentious differences over ending Syria's civil war and restoring stability in eastern Ukraine.

Opening talks in Moscow with Russian Foreign Minister Sergey Lavrov before seeing President Vladimir Putin, Kerry said the world benefits when great powers agree in their approaches to major crises.

"Even when there have been differences between us, we have been able to work effectively on specific issues," Kerry said as he began a series of what are expected to be difficult discussions in the Russian capital. "Today, I hope we can find some common ground."

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Russia and the U.S. are at odds over the mechanics of a political transition aimed at halting the war in Syria, as well as the military approach to fighting the Islamic State in Iraq and Syria (ISIS) group. The results of Tuesday's meetings will determine whether or not a new international diplomatic conference on Syria will go ahead as planned at the United Nations on Friday.

"Outstanding issues"

On Ukraine, the two countries are split over the implementation of a February agreement meant to end hostilities between the Kyiv government and Russian-backed separatists in the east.

Lavrov noted "outstanding issues" on steps ahead in the Syrian political transition that is supposed to bring representatives of President Bashar Assad's government together with the opposition for negotiations by early January. And, on Ukraine, Lavrov said the U.S. should use its influence with the government in Kyiv to settle the conflict with Russian-backed separatists by respecting a shaky cease-fire and moving ahead with political reforms in the east of the country.

Kerry praised Moscow for having been "a significant contributor to the progress that we have been able to make" on Syria and said the U.S. and Russia both believe the Islamic State group must be eliminated.

"Russia and the United States agree that this is a threat to everybody, to every country," he said. "They are the worst of terrorists. They attack culture and history and all decency. It leaves no choice but for civilized nations to stand together, to fight and destroy them."

However, ahead of his arrival, Russia's foreign ministry said Moscow would be looking for a "revision" in U.S. policy "dividing terrorists into 'bad' and 'good' ones." It also complained that the U.S. was unwilling to engage in "full-fledged co-ordination" between the two powers' militaries while both are conducting airstrikes in Syria.

Russia says its airstrikes since late September have targeted the Islamic State, but Western governments claim mostly moderate rebels are being hit and that Moscow is primarily concerned with shoring up Assad.

Assad's future iskey topic

Assad's future and his potential role in the political transition will be prime topics of Kerry's conversations with Putin and Lavrov. Russia has consistently said Assad's future is for the Syrian people to decide, while the U.S. and many of its allies insist that he go, although they have softened their stance somewhat to allow Assad to play a temporary but as-yet undefined role in the transition. Syrian opposition groups, however, demand that Assad leave at the start of the process.

Kerry's trip to Moscow is his second to Russia this year he met with Putin in the Black Sea resort of Sochi in May but his first since frosty relations over Ukraine and Russia's annexation of Crimea were exacerbated by Moscow's intervention in Syria in late September. President Barack Obama has seen Putin briefly twice since then at summits in Turkey and France.

Kerry said "nothing would please us more than to resolve the differences on Ukraine" but there was little sign of a convergence. The U.S. and its European allies have imposed sanctions on Russia for its continued support for separatists in the east.

Kerry is asking for Russia's full implementation of a February cease-fire in exchange for sanctions relief. That truce called for the removal of heavy weaponry from front lines, a Russian troop withdrawal, the release of detainees and full access for international monitors. But the cease-fire has become increasingly strained.

Lavrov, however, put the responsibility for a resolution squarely on Washington.

"Of course, we would like to continue the dialogue ... on how the United States can assist with the Ukrainian settlement," he said. "Given the U.S. influence on Kyiv, it would be a positive factor."