President Barack Obama's national security advisor used the anniversary of a major nuclear arms reduction treaty Friday to call on Russia to accept further arms talks.

Five years after Washington and Moscow agreed the New Strategic Arms Reduction Treaty, Susan Rice called on Russia to take the next step.

"(We) continue to call on Russia to answer the president's invitation five years ago to begin talks on further reductions to our nuclear arsenals," Rice said.

The current agreement, which has yet to be fully implemented, put a cap of 1,550 deployed nuclear warheads and 700 deployed delivery vehicles for both sides.