* Graphic: World FX rates in 2019 tmsnrt.rs/2egbfVh
By Saikat Chatterjee
LONDON, Sept 3 (Reuters) - World stocks slipped and the dollar strengthened to its highest levels in more than two years on Tuesday as U.S.-China trade tensions drove investors to the relative shelter of gold, the Japanese yen and government debt.
Sterling was the big mover in currency markets, nearing a three-year low below $1.20 with British Prime Minister Boris Johnson set for a showdown with Parliament over a no-deal Brexit.
With U.S. markets shut on Monday, global markets took their cue from weak PMI survey data in Europe and China which raised concerns the global economy was struggling on many fronts.
An index of global stocks slipped 0.2% on Tuesday, heading towards a two-month low hit in early August. An index of Asian stocks was down 0.8%.
Tensions over trade between Washington and Beijing have shown little sign of abating even though U.S. President Donald Trump has said the two sides would meet for talks this month.
"Since the trade dispute has become the driving force behind equity markets, we advise against adding significantly to equity exposure, particularly for those with an adequate strategic allocation," Mark Haefele, chief investment officer at UBS Global Wealth Management, said.
European stocks were on the back foot as investors locked in profits from a three-day streak that saw indices scale near one-month highs. An index of European stocks was down 0.3%.
The move away from equities boosted demand for government debt with yields on benchmark U.S. Treasury bonds tumbling to towards a three-year low hit last week as investors also ramped up their bets the global economy is headed for recession.
Market watchers are hoping that U.S. data would undermine some of those bearish bets on the global economy, with surveys from the Institute for Supply Management due later in the day and U.S. payrolls data scheduled for Friday.
"The ISM ... is going to be (a) particular important market mover as those who have been buying bonds strongly, suggesting that the U.S. is on course for recession, need to see some sort of justification," said Andrew Milligan, head of global strategy at Aberdeen Standard Investments.
The yield on 10-year U.S. Treasuries fell 2 basis points to 1.482%, off a three-year low of 1.443% touched last week. The yield dropped more than 50 basis points last month, the biggest monthly drop since August 2011.
Keeping in line with a general mood of risk aversion, the yen gained 0.2% against the greenback while gold firmed towards more than a six-year high.
In the currency market, sterling slumped below $1.20 to a three-year low, as Prime Minister Johnson's implicit ultimatum to lawmakers to back him on Brexit or face an election sent investors scrambling to dump British assets.
Oil prices were also dented by trade war concerns. U.S. West Texas Intermediate (WTI) crude lost 0.47% to $54.84 per barrel. International benchmark Brent futures dipped 0.05% to $58.63 per barrel.
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Reporting by Saikat Chatterjee; Additional reporting by Karin Strohecker; Editing by Alexander Smith and Catherine Evans