The council met behind closed doors to discuss tightening sanctions on North Korea following the launch on Sunday of a medium-range missile that again raised alarm over Pyongyang's military capabilities.
U.S. forces are lingering off the Korean Peninsula as tensions boil over the tyrant's repeated missile tests and talk of nuclear weapons.
UNITED NATIONS North Korea's deputy United Nations envoy said on Friday "it is ridiculous" to link Pyongyang with the WannaCry "ransomware" cyber attack that started to sweep around the globe a week ago or the hacking of a U.N. expert monitoring sanctions violations.
North Korea is also building nuclear-tipped missiles and has greeted new South Korean President Moon Jae-in, who wants to reach out to the North, with two missile test-launches, part of a flurry of tests since leader Kim Jong Un took over in late 2011.
South Korea fired warning shots on Tuesday at a flying object that entered the country's airspace from North Korea across the Demilitarised Zone, Seoul's military said.
China - which North Korea relies on for most foreign goods - sold just $288.2m (£222m) of supplies back that same month - down 12% from March.
The council also expressed their commitment to "a peaceful, diplomatic and political solution to the situation", and welcomed efforts by its members, as well as other countries, "to facilitate a peaceful and comprehensive solution through dialogue".
It called the missile, capable of reaching Japan and major U.S. military bases there, an "answer" to U.S. President Donald Trump's policies.
North Korea is believed to have a fleet of more than 1,300 fighter jets, as well as an unspecified number of its own unmanned aerial vehicles, according to a 2015 report to Congress from the US Department of Defense. It "immediately went towards the North", a South Korean official said at the time.
Bessho said Japan hopes the council will "strengthen the measures and strengthen the sanctions mechanism".
The mystery flying object may have been a drone, local media speculated.
"It is important to lower North Korea's foreign currency earnings and prevent nuclear missile related shipment and technological transfer in order to prevent North Korea's nuclear missile development".
The Security Council adopted two sanctions resolutions a year ago to ramp up pressure on Pyongyang and deny leader Kim Jong-Un the hard currency needed to fund his military programmes.
"North Korean balloons landing now in South Korea is not new", Pastor Eric Foley, CEO of the Voice of the Martyrs Korea, which frequently sends balloons into the North, told NK News.