The U.S. envoy working on enforcing United Nations sanctions against North Korea says sharing information among U.N. members is key to holding Pyongyang accountable for its banned nuclear activities.

Philip Goldberg spoke to reporters Thursday in New York after meeting the U.N. North Korea sanctions committee.

The U.N. imposed tough new restrictions on North Korea last month after the reclusive country launched ballistic missiles and conducted its second nuclear test.

The sanctions aim to cut off funding for Pyongyang's nuclear, missile and proliferation activities.

Goldberg called the measures "unprecedented," a word he also used to describe China's cooperation in implementing them.

He said the U.S. is advising its banks about activities related to North Korean entities.

He said he thinks other governments have taken similar positions, and they now have to share that information with each other.

The U.S. State Department says Goldberg will lead a delegation to Moscow on Monday.

The delegation will consult with Russian Foreign Ministry and financial officials about enforcing the sanctions.  

Goldberg also is traveling to undisclosed Asian capitals for similar consultations in mid-August.