* Bank of Korea unexpectedly raises rates
* Monetary Authority of Singapore tightens policy
* New Zealand, Canada delivered largest hikes in two decades
* Analysts say central banks rushing to beat inflation risks
* Ukraine war adds to already heightened supply constraints
By Cynthia Kim and Aradhana Aravindan
SEOUL/SINGAPORE, April 14 (Reuters) - Singapore and South Korea both tightened monetary policy on Thursday, hot on the heels of rate hikes in Canada and New Zealand, as global policymakers moved quickly to prevent soaring inflation from derailing a fragile world economic recovery.
While the four central banks began tightening policy last year to stem price rises caused by coronavirus-driven logistics bottlenecks, the war in Ukraine, which started Feb. 24, has since intensified supply pressures, heightening the urgency for policymakers to bring forward planned rate hikes.
"We're likely to see more Asian central banks push forward the timing of interest rate hikes," said Toru Nishihama, chief economist at Dai-ichi Life Research Institute in Tokyo. "That could hurt growth but with inflation becoming a more imminent concern, there's little choice for them but to move toward tighter monetary policy."
Asia-Pacific economies largely lagged U.S. and European reopenings from the pandemic, which meant central banks in Australia, India and Southeast Asia had up until now mostly seen inflation pressures as transitory, with a focus more on shoring up their recoveries.
Singapore, South Korea and New Zealand were the exceptions and were particularly concerned about surging import price costs and financial stability more generally.
The Bank of Korea delivered a surprise quarter of a percentage point rate hike on Thursday.
Most economists had expected it to hold fire while it awaited the appointment of a new governor but with inflation in Asia's fourth-largest economy running at a decade-high, the bank said waiting was not an option.
Singapore, meanwhile, tightened its policy, which influences its currency rather than interest rates, for the third time in six months, citing fresh risks from the Ukraine war.
Both meetings came less than a day after commodity-rich economies New Zealand and Canada lifted their respective rates by a hefty half a percentage point, their largest such hikes in two decades.
New Zealand's hike was larger than what economists had expected and Canada warned more would be needed.
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Vishnu Varathan, head of economics and strategy at Mizuho Bank, said Singapore, South Korea, New Zealand and Canada were part of a group that saw an urgent need to get ahead of the inflationary threat.