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Suifenhe, a city of just under 70,000 that is frozen-in for much of the year, has at least 243 imported COVID-19 cases out of almost 1,000 confirmed and suspected cases, according to official figures.
This is the highest number of reported infections since March 6, when authorities counted 143 new cases.
Imported cases accounted for a record 98. There has been more than 82,000 confirmed cases of COVID-19 in mainland China with more than 3,300 fatalities since the start of the coronavirus pandemic.
The figure includes 98 travellers returning from overseas, according to the National Health Commission.
State media have reported that people crossing from Russian Federation are spreading the virus in the border city of Suifenhe in northeastern Heilongjiang province.
With the cities of Suifenhe and Harbin now mandating 28 days of quarantine as well as antibody testing for all arrivals from overseas.
Housing units in the city with confirmed and asymptomatic cases will also be placed under lockdown for 14 days, and all residents there will be given nucleic acid tests and antibody tests, according to authorities.
China has been trying to open up its cities after imposing lockdowns due to the COVID-19 pandemic.
The cut came largely in line with market expectations, as economists believe the central bank would keep its yield curve steady by lowering the MLF rate by the same margin as the cut to the 7-day reverse repo rate in late March.
The outbreak peaked in China mid-February, reporting 15,000 new cases on February 13, according to the Johns Hopkins University tracker.
The viral disease has since spread to over 170 countries, infecting 18 lakh people and killing 1.1 lakh.
This performance shouldn't be interpreted as meaning Covid-19 had effectively no impact on China's crude demand, rather it should be viewed as proof that the world's largest crude importer still has the appetite and ability to stockpile.
The virus attacks a host's respiratory system triggering symptoms such as fever, cough, and breathing difficulties. Of the cases, 596 had been discharged from hospitals after recovery, 904 were being treated with 45 in severe condition and no death had been reported, said the commission.