Chinese Foreign Ministry spokesman Lu Kang displayed a photograph of Indian 'incursion' into Donglong area.
His remarks came in response to the India-US joint statement issued after the talks between Prime Minister Narendra Modi and US President Donald Trump.
It is equipped with new air defence, anti-missile, anti-ship and anti-submarine weapons.
China said that it had put off the visit of Indian pilgrims who enter Tibet via the Nathu La pass "for safety reasons" in view of the border issue.
Foreign ministry spokesman said no change in China's position in case of non-NPT countries.
The NSG plenary meeting is due to be held next week in the Swiss capital of Bern.
The blast happened around 4:50 pm at the front gate of the kindergarten in Fengxian County in east China's Jiangsu Province when children were leaving the school, officials were quoted as saying by the state-run Xinhua news agency.
China on Monday said India's membership bid in the NSG has become "more complicated" under the "new circumstances" as it again ruled out backing New Delhi's entry in the grouping, saying there should be non-discriminatory solution applicable to all non-NPT signatory countries.
In the fourth such incursion since March, two helicopters of the People's Liberation Army of China hovered for about five minutes in Uttarakhand's Chamoli district and "could have carried out aerial photography of Indian ground troops," according to official sources in the government.
Last year, Chinese media sharply criticised the Malabar exercises.
The 9.5-km long bridge inaugurated by Prime Minister Modi on May 26 is India's longest bridge.
The fighter plane has been untraceable since Tuesday.
China on Monday said there is no change in its stance on admission of non-NPT states into the Nuclear Suppliers Group
India boycotted the Belt and Road Forum held from May 14-15.
India's decision to skip the meeting came after a year of bilateral discord over China's stubborn opposition to India's entry into the Nuclear Suppliers' Group and a UN ban against Pakistan-based terrorist group Jaish-e-Mohammed leader Masood Azhar.
China said the US delegation's visit to Dharamshala and their meeting with the Dalai Lama has "sent a very wrong signal to the outside world about supporting Tibetan independence and violated the US government's commitment not to support Tibet's independence."
The People's Liberation Army Rocket (Missile) Force tested the new missile in the Bohai Sea.
Seeking to allay India's concerns, ambassador Luo had offered to rename the CPEC which passes through Pakistan-occupied Kashmir, insisting it was an economic cooperation and connectivity enhancement project devoid of "sovereignty issues".
At the event, about 100 people were told they could become US residents under a 'EB-5' visa programme if they put $500,000 (Rs 3.21 crore) into the project.
Beijing's sky was gloomy and the ground largely deserted.