By Timothy Heritage

ST. PETERSBURG, Russia (Reuters) - China warned on Thursday that military intervention in Syria would hurt the world economy and push up oil prices, reinforcing Vladimir Putin's attempts to talk U.S. President Barack Obama out of air strikes.

The rift over Syria could overshadow a summit of the Group of 20 (G20) developed and developing economies in St. Petersburg at which global leaders want to forge a united front on growth, trade, banking transparency and fighting tax evasion.

The club that accounts for two thirds of the world's population and 90 percent of its output is divided over issues such as turmoil in emerging markets and the Federal Reserve's decision to end its program of stimulus for the U.S. economy.

But no rift is wider than the one between the U.S. and Russian leaders on possible military intervention in Syria to punish President Bashar al-Assad over a chemical weapons attack that killed hundreds of people on August 21.

Putin was isolated on Syria at a Group of Eight meeting in June, the last big meeting of world powers, but now has China to back him at the G20 summit in Russia's former imperial capital.

"Military action would have a negative impact on the global economy, especially on the oil price - it will cause a hike in the oil price," Chinese Vice Finance Minister Zhu Guangyao told a briefing before the start of the G20 leaders' talks.

In Beijing, Foreign Ministry spokesman Hong Lei reiterated that any party resorting to chemical warfare should accept responsibility for it but said unilateral military actions violate international law and would complicate the conflict.

Like Moscow, one of Syria's main arms suppliers, Beijing has veto powers on the United Nations Security Council. Obama is unlikely to win Security Council approval for military action but is seeking the approval of the U.S. Congress.

France echoed Obama's call for action over the gas attack, which Washington blames on Syrian government troops and Moscow says may have been carried out by rebels trying to oust Assad.

"The position of France is to punish and negotiate," Foreign Minister Laurent Fabius told France 2 television before travelling to St. Petersburg, where Putin is hosting the summit in a tsarist palace on the coast.

"We are convinced that if there is no punishment for Mr. Assad, there will be no negotiation," he added. "Punishment will allow negotiation, but obviously it will be difficult."

Fabius, whose country is preparing to support the U.S. military action with own forces, said Syria would be discussed at the summit even though it is not formally on the agenda.

Putin has said he would like to hold one-on-one talks with Obama but a Kremlin spokesman said no such meeting was planned. Last month, Obama pulled out of talks with Putin that had been scheduled for Wednesday, and U.S.-Russian ties are in freefall.

Foreign ministers from key states in the G20 - which includes all five permanent U.N. Security Council members - will also discuss Syria on the sidelines of the meeting.

Any G20 decision on Syria would not be binding but Putin would like to see a consensus to avert military action in what would be a significant - but unlikely - personal triumph.

Obama used a visit to Sweden on Wednesday to build his case for a military response, saying: "The international community's credibility is on the line." Putin increased the volume as well, accusing Secretary of State John Kerry of "lying" by playing down the role of the militant group al Qaeda with rebel forces.

LOSS OF HARMONY

The G20 achieved unprecedented cooperation between developed and emerging nations to stave off economic collapse during the 2009 financial crisis, but the harmony has now gone.

There are likely to be some agreements - including on measures to fight tax evasion by multinational companies - at the summit in the spectacular, 18th-century Peterhof palace complex, built on the orders of Tsar Peter the Great.

An initiative will be presented to leaders on refining regulation of the $630-trillion global market for financial derivatives to prevent a possible markets blow-up.

Steps to give the so-called 'shadow banking' sector until 2015 to comply with new global rules will also be discussed.

But consensus is proving hard to achieve among developed economies as the United States takes aggressive action to spur demand and Europe moves more slowly to let go of austerity.

Meanwhile, emerging economies in the BRICS countries - Brazil, Russia, China and South Africa - are divided over the role of the U.S. dollar in the world economy. And there has been no sign of them rallying behind the fifth BRICS member, India, after it called on Friday for joint currency intervention.

Russia and China also joined forces in warning about the potential impact of the Fed ending its bond-buying program to stimulate the economy. Zhu urged the United States to be "mindful of the spillover effects and work to contribute to the stability of the global financial markets and the steady recovery of the global economy".

The International Monetary Fund will call at the meeting for strengthened global action to revitalize growth and better manage risks, according to an IMF document seen by Reuters.

But with the United States and other advanced economies picking up speed, the IMF said it still expected global growth to accelerate in 2014 from this year, helped by the highly accommodative monetary conditions in the rich world.

Further friction on the fringes of the summit could be caused by Obama's plans to meet human rights activists including members of a gay rights group which staged protests against a law Putin signed banning "gay propaganda" among children.

(Reporting by Gernot Heller, Luke Baker, Tetsushi Kajimoto, Lidia Kelly, Katya Golubkova, Alessandra Prentice and Denis Dyomkin, and by Ben Blanchard in Beijing; Writing by Timothy Heritage; Editing by Steve Gutterman and Alastair Macdonald)

圣彼得堡,俄罗斯(路透社)——星期四警告说,中国对叙利亚的军事干预会损害全球经济,并推高油价,增强普京的企图说服美国总统奥巴马的空袭。

在叙利亚的裂痕就可能超过一个峰会召开的二十国集团(G20)发达国家和发展中经济体在圣彼得堡,全球领导人想要打造一个统一战线在增长、贸易、银行透明度和打击逃税。

俱乐部,占三分之二的世界人口和90%的输出是分歧等问题在新兴市场动荡,美联储决定终止其项目的刺激美国经济。

但是没有裂谷是更广泛的比美国和俄罗斯领导人之间可能的军事干预叙利亚总统巴沙尔•阿萨德惩罚在化学武器攻击,导致数百人丧生于8月21日。

普京是孤立叙利亚在八国集团会议在6月,最后大会议,但是现在世界大国中国支持他在G20峰会在俄罗斯的前帝国的首都。

“军事行动将有负面影响,对全球经济,尤其是在油价——这将导致石油价格的提高,“中国财政部副部长朱光耀在发布会上开始前20国集团领导人会谈。

在北京,外交部发言人洪磊重申,任何一方采取化学战争应该接受责任,但说单边军事行动违反国际法,将复杂的冲突。

和莫斯科一样,一个叙利亚最大的军火供应商,北京有否决权的联合国安理会。奥巴马是不可能赢得安理会批准的军事行动,但正在寻求美国国会的批准。

法国响应奥巴马的行动呼吁在气体攻击,华盛顿指责叙利亚政府军队和莫斯科说可能已经进行了叛军试图推翻阿萨德。

“法国的位置是惩罚和谈判,”外交部长洛朗费边告诉法国2电视前前往圣彼得堡,普京主持这次峰会在沙皇的宫殿在海岸。

“我们相信,如果没有惩罚阿萨德,就没有谈判,”他补充说。“惩罚会让谈判,但显然这将是困难的。”

费比乌斯,他的国家正准备支持美国的军事行动与自己的部队,说叙利亚将在峰会上讨论,即使它不是正式列入议程。

普京表示,他愿意与奥巴马举行一对一会谈,但克里姆林宫发言人说没有这样的会议计划。上个月,奥巴马与普京退出谈判,已定于周三,和美国俄关系直线下降。

外交部长从关键州在G20——其中包括所有五个联合国安理会常任理事国——还将讨论叙利亚会议期间。

任何G20决定叙利亚不具有约束力,但普京希望看到一个共识,避免军事行动在什么将会是很重要的,但不可能——个人的胜利。

奥巴马利用周三访问瑞典建立他的理由军事回应,他说:“国际社会的公信力正在线。“普京增加音量,指责国务卿约翰·克里的“说谎”,淡化这个激进组织的作用与反政府武装基地。

失去和谐

G20取得了前所未有的发达国家和新兴国家之间的合作来避免经济崩溃在2009年的金融危机,但和谐已经。

有可能是一些协议——包括措施打击逃税的跨国公司——在峰会上的壮观,18世纪的Peterhof宫复杂的命令,建立在沙皇彼得大帝。

一个倡议将提交给领导人精炼监管630万亿美元的全球的金融衍生品市场以防止可能的市场危机。

步骤给所谓的“影子银行”领域,直到2015年遵守新的全球规则也将被讨论。

但共识都很难实现在发达经济体作为美国采取积极行动来刺激需求和欧洲行动更加缓慢放开紧缩。

与此同时,新兴经济体在金砖国家(巴西、俄罗斯、中国和南非——看法不一美元的角色在世界经济。和还没有迹象显示他们严阵以待第五金砖国家成员,印度,在这周五呼吁联合干预汇市。

俄罗斯和中国也加入了部队在警告的潜在影响美联储结束其债券购买计划来刺激经济。朱敦促美国“正念的溢出效应和工作贡献稳定的全球金融市场和全球经济的稳定复苏”。

国际货币基金组织将在会上打电话加强全球行动重振增长和更好地管理风险,根据国际货币基金组织的文档被路透社。

但与美国和其它发达经济体加速,国际货币基金组织表示,全球经济增长仍预期从2014年的加速的帮助下,今年的高度宽松货币政策在发达世界。

进一步的摩擦的边缘,峰会可能是由于奥巴马的计划满足人权活动人士包括一个同性恋权利团体的成员,举行抗议活动反对普京签署一项法律禁止儿童“同性恋宣传”。

(完Gernot海勒,卢克贝克,Tetsushi Kajimoto,莉迪亚凯利,卡蒂亚,亚历山德拉Golubkova普伦蒂斯和丹尼斯Dyomkin,本布兰查德在北京由Timothy遗产;写作;编辑史蒂夫·小贩和阿拉斯泰尔•麦克唐纳)

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