European and US stock markets fell Wednesday with sentiment dented by heightened geopolitical worries, dealers said.
London equities fell 0.7 per cent in afternoon trading, owing to a strong pound, which extended gains on receding fears of a no-deal Brexit.
In the eurozone, Frankfurt dropped 0.3 per cent and Paris slid 0.2 per cent.
Wall Street also opened lower, with the Dow dipping 0.2 percent in the first minute of trading.
"Rising geopolitical tensions dominates trading, sending global equities... lower as India clashes with Pakistan," said Oanda analyst Dean Popplewell.
Trading floors were shaken in Asia by a statement from the Pakistan Air Force that it had downed two Indian planes and arrested one of the pilots. New Delhi confirmed the loss of one of its planes and said it had shot down a Pakistani fighter jet.
While both sides have sought to play down the threat of war, the rare aerial engagement over the divided and disputed territory of Kashmir significantly raises the stakes in a standoff sparked by a suicide attack on the Indian-controlled side earlier this month.
The developments came a day after warplanes struck a site in Pakistan that New Delhi said was a militant training camp, in retaliation for a February 14 suicide bombing in the disputed region that killed 40 Indian troops.
Meanwhile, investors remain on tenterhooks over US President Donald Trump's summit with North Korean leader Kim Jong Un.
And there remains lingering uncertainty over the long-running trade dispute between Beijing and Washington.
"Equity markets are in the red ... as geopolitics is playing on traders' minds," said CMC Markets analyst David Madden.
In addition to the Trump-Kim meeting, investors are still watching for any movement towards resolving the US-China trade spat.
"We heard this week that tariffs on Chinese imports won't be hiked in March, but the trade dispute still needs to be finalised, and we are still a long way from the end result," said Madden.
On currency markets, hopes that Britain will not leave the European Union without a divorce pact in place provided more support to the pound.
Sterling had already surged Tuesday on Prime Minister Theresa May's decision to let MPs vote on a three-month delay to the March 29 Brexit deadline if she is unable to ram through her own deal.
The UK retail sector was also in the spotlight after Marks and Spencer revealed it would team up with online supermarket Ocado to deliver M&S food direct to homes.
But M&S shares dived 10.6 per cent to 270.8 pence after saying it would slash its dividend -- and raise up to 600 million pound from a rights issue to help fund the deal.
On the upside, Ocado shares jumped 2.2 per cent to 1,012 pence.
Shares in Air France-KLM tumbled 10.6 per cent to 11.38 euros after Paris reacted bitterly to a move by the Dutch government to take a stake in the airline equal to that held by the French government.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)