* Trump's ban on top China tech firms sours optimism
* MSCI ex-Japan Asia down 1.4%, Tencent falls 10%
* Hopes of U.S. stimulus bolster shares despite lack of progress
* Gold hits record high before profit-taking
* Asian stock markets: https://tmsnrt.rs/2zpUAr4
By Hideyuki Sano
TOKYO, Aug 7 (Reuters) - World stock markets tumbled on Friday after U.S. President Donald Trump ratcheted up already-heightened tensions with Beijing by banning U.S. transactions with two popular Chinese apps, Tencent's WeChat and ByteDance's Tiktok.
MSCI's broadest index of Asia-Pacific shares outside Japan .MIAPJ0000PUS lost 1.4% and Hong Kong's Hang Seng .HSI fell 2.4%. Tencent 0700.HK , Asia's second-biggest company by market capitalisation, dropped as much as 10.1%.
Mainland China's CSI 300 Index .CSI300 fell 1.3% while Japan's Nikkei .N225 slipped 0.6%. S&P500 futures ESc1 slid 0.5%.
Trump issued the executive orders after his administration said this week it was stepping up efforts to purge "untrusted" Chinese apps from U.S. digital networks and called TikTok and WeChat "significant threats."
Coming days after the United States ordered China to vacate its consulate in Houston, the move looks set to trigger retaliatory action by Beijing, stoking fears that a "silicon curtain" is emerging between the two superpowers. could block Apple (NASDAQ:AAPL) or Microsoft (NASDAQ:MSFT) from China. The information sector growingly looks divided into two camps. We could be seeing just the beginning of an information technology war," said Nana Otsuki, chief analyst at Monex Securities.
"Investors in the West would have to hesitate to invest in China, missing growth opportunities there when there are not many investment opportunities except perhaps except for Nasdaq."
The announcement dampened any excitement from China's trade data, which showed exports surged 7.2% from a year earlier, way above economists' forecast of 0.2% fall. also poured cold water on what had been a mildly positive mood on hopes U.S. policymakers will finalise stimulus worth at least $1 trillion to support the country's fragile economy.
On Wall Street on Thursday, the S&P 500 .SPX gained 0.64% and the Nasdaq Composite .IXIC added 1%, marking the fourth straight day of record peaks.
The White House and Democrats remained far apart about its size and what to include in a stimulus package. But that has not shaken investors conviction of an eventual deal as they believe the economy would falter without such support. number of Americans seeking jobless benefits for the first time fell last week but a staggering 31.3 million people still received unemployment checks in mid-July, suggesting a resurgence in COVID-19 cases is hampering hiring. watched U.S. non-farm payrolls data, due at 1230 GMT, is expected to show an increase of 1.58 million in July, compared to 4.8 million in June.
U.S. bond yields have flirted with historic lows, as investors bet the Federal Reserve will keep monetary policy loose for the foreseeable future.
The 10-year U.S. Treasuries yield US10YT=RR dipped 1.6 basis points to 0.5198%, near Thursday's five-month low of 0.504%.
Trend-following speculators appear to be buying both stock and bond futures, unusual behaviour as they normally tend to rotate from one asset to another, said Masanari Takada, cross-asset strategist at Nomura Securities.
"They seem to be aggressively buying both Treasuries futures and Nasdaq futures, probably with high leverage as market volatility, especially that of Treasuries, has been so low. But this suggests after they have bought everything, there is risk they will sell everything," he said.
The prospects of a prolonged period of easy U.S. monetary policy has been supporting various asset prices while depressing the dollar.
Gold XAU= hit a record high of $2,075.2 per ounce XAU= before succumbing to profit-taking to slip to $2,054.
Silver dropped 1.8% to $28.3908 per ounce XAG= following its ballistic rise to a seven-year high of $29.8384.
The U.S. dollar, which has been in a clear downtrend since late July, edged back against risk-sensitive currencies after Trump's move.
The euro fell 0.3% to $1.1835 EUR= while the Australian dollar shed 0.4% to $0.7207 AUD=D4 . The Chinese yuan eased 0.2% to 6.9675 per dollar CNY=CFXS .
Oil prices were little changed, with Brent futures LCOc1 down 0.1% at $45.04 per barrel. (Editing by Lincoln Feast.)