Updated

Russia will begin working on a new generation of nuclear missiles to ensure its nuclear deterrent remains effective, President Dmitry Medvedev said Thursday.

Medvedev said the new missiles would be developed in full accordance with arms agreements made with the United States.

"Of course, we will develop new systems, including delivery systems, that is, missiles," Medvedev said in an end-of-year interview with state-run TV channels.

"This process will be continued, and our nuclear shield will always be efficient and sufficient to protect our national interests," Medvedev said.