TOKYO (REUTERS) – Asia shares tumbled on Friday (May 22) as Hong Kong’s political unrest returned as a flashpoint in fast-deteriorating US-China relations, following Beijing’s moves to impose a new security law on the city.

The Asian financial hub’s benchmark Hang Seng index sank 5 per cent to a seven-week low, pulling MSCI’s broadest index of Asia-Pacific shares outside Japan down 2.5 per cent.

The CSI300 index of mainland Chinese shares dropped 1.9 per cent while Japan’s Nikkei lost 1 per cent. Pan-European Euro Stoxx 50 futures were down 0.97 per cent while e-mini futures for US S&P500 lost 0.8 per cent.

Singapore’s Straits Times Index was down 2.3 per cent at 2:42am local time.

China is set to impose new national security legislation on Hong Kong to tighten its grip on the semi-autonomous city.

The decision drew a warning from President Donald Trump that Washington would react “very strongly” against the attempt to gain more control over the former British colony.

“It is starting to look like a US-China summer of discontent in the making,” said Stephen Innes, chief global market strategist at AxiCorp.

“So far, China’s response has been relatively tame despite Trump’s daily goading. That might be due so that policymakers can focus on the NPC, but there is always the possibility of a firmer response.”

Hong Kong activists called on Friday for people to rise up against Beijing’s plans although a proposed midday march in the central financial district did not materialise.

The new Sino-US rift comes amid already tense relations between the two superpowers after Washington stepped up its rhetoric against China over the coronavirus and other points of difference.

Earlier this month, the US State Department delayed a report to Congress assessing whether Hong Kong enjoys sufficient autonomy from China to continue receiving special treatment from the United States.

Washington has ramped up criticism of China over the origins of the pandemic. Last week, it moved to block global chip supplies to blacklisted telecoms equipment giant Huawei Technologies, while the US Senate passed legislation that could prevent some Chinese companies from listing their shares on US exchanges.

Rising tensions are casting a pall over recent optimism that the worst of the pandemic’s economic impact was already over in most developed countries.

The pace of recovery remains highly uncertain – a point highlighted by China’s decision not to set an economic growth target this year for the first time in decades.

While Beijing pledged more government support for the virus-hit economy, it set a target to create over 9 million urban jobs this year, down from a goal of at least 11 million in 2019 and the lowest since 2013.

“The absence of a GDP growth target for this year confirms that, as we expected, policymakers accept that, after the plunge in Q1, economic growth will be low for 2020 as a whole even with a significant sequential recovery in Q2-Q4,” Oxford Economics said in a note to clients.

“The sizeable overall fiscal deficit target indicates significant policy support for the domestic recovery that we expect to continue despite the challenging external background. We expect year-on-year GDP growth to average 4 per cent in H2.”

The worsening mood pushed riskier currencies lower, with the Australian dollar dropping 0.5 per cent to $0.6531 and the euro easing 0.25 per cent to $1.0922.

The safe-haven yen gained 0.15 per cent to 107.45 per dollar.

The yen brushed off the Bank of Japan’s new lending scheme to channel more money to small businesses, which mimics the US Federal Reserve’s “Main Street” programme.

The decision had been widely anticipated after the BOJ flagged the creation of the scheme last month.

Oil prices also tumbled from a two-month peak with US crude futures losing 7.3 per cent to $31.44 per barrel.