Council diplomats, speaking anonymously because discussions were private, said the USA, which is in charge of drafting council statements and resolutions on North Korea, had dropped the call for "dialogue" as part of its effort to toughen the text. It also stated that Pyongyang's ballistic missile launches are "illegal" and that the country has been developing nuclear weapons.
North Korea back then committed to dismantling its Yongbyon nuclear power plant, but in 2009 launched a space rocket with technology that could be used for a long-range missile, prompting condemnation from the United Nations Security Council as well as the return to diplomatic isolation.
Two days earlier, Pence took part in some unscheduled mean-mugging at North Korea, stepping outside of the South Korean Freedom House to look across the demilitarized zone.
South Korea's acting president, Hwang Kyo-ahn, at a meeting with top officials on Thursday, repeatedly called for the military and security ministries to maintain vigilance.
South Korea's Defense Ministry also confirmed on Thursday that the US and South Korean Air Forces are conducting an annual training exercise - codenamed Max Thunder - until April 28.
The council said North Korea's illegal missile and nuclear activities "are greatly increasing tension in the region and beyond" and expressed "utmost concern" at its "highly destabilizing behavior and flagrant and provocative defiance" of six United Nations sanctions resolutions.
The statement issued later Thursday by the council includes the language Russian Federation wanted.
The council has imposed six sets of sanctions on North Korea - two of which were adopted previous year to significantly ramp up the punitive measures and deny Kim Jong-Un's regime hard currency revenue. "Through this exercise, I am sure we can deter war and remove our enemy's intention to provoke us".
"We are requesting to use the agreed language", Russian charge d'affaires Petr Iliichev said.
"Speaking with one voice is extremely important to the Security Council appropriately responding to the relevant issue on the peninsula", he told reporters.