As tensions between Russia and the West mount over the military conflict in Georgia, some analysts worry about the collapse of arms control agreements.

A mysterious Israeli air raid in Syria has led to speculation that North Korea is outfitting Damascus with nuclear material.

U.S. officials say a proposed missile defense shield is not aimed at Russia but the Kremlin disagrees, suspending participation in a conventional arms treaty.

Scott A. Snyder discusses the political targets of North Korea's missile test.

Russia has suspended its participation in a treaty on conventional arms and voiced opposition to a missile shield in its backyard. Is a new era of mutual hostility in the making?

In this First Take, CFR's James M. Lindsay says President Obama's decision to alter missile defense plans in Eastern Europe makes sense from a military standpoint but he faces challenges in selling the strategy to Americans.

This timeline looks at the history of U.S.-Russia arms control milestones from 1949 to present.

An interactive, multimedia guide to the dispute between North and South Korea.

The Obama administration's Nuclear Posture Review charts new positions on potential targets of U.S. atomic weapons, preventing proliferation, and developing new weapons, says CFR's Michael Levi.

Following a post-Cold War erosion of senior level attention to nuclear weapons stewardship, the Air Force general charged with protecting the U.S. nuclear arsenal says his service is finally regaining its strategic focus.

CFR's Charles A. Kupchan says President Obama's summit meetings have advanced relations with Russia and consensus with industrialized states on climate change but that difficult work is ahead on both fronts.

Pavel Felgenhauer, an independent defense analyst in Moscow, is pessimistic about a Russia-U.S. rapprochement in part because of enduring concerns about U.S. missile defense system plans.

Charles A. Kupchan, CFR senior fellow for Europe studies, says Obama's "popularity and the departure of President Bush" create a "window of opportunity to improve relations between the United States and Russia and between the United States and the European Union.

Spector, a nuclear nonproliferation expert, discusses the merits of the U.S.-India nuclear agreement and its prospects for passage during the Bush administration.

Stephen Sestanovich, CFR’s top Russia expert, says the informal summit at Kennebunkport, Maine, restored nuclear issues as “the core of the relationship.”

Charles A. Kupchan, CFR’s top European expert, says the just-concluded G8 conference in Germany was notable for the clear effort of Presidents Putin and Bush to put aside their sharp differences on European missile defense. Kupchan also noted the compromise worked out by Bush with the European Union states on climate control issues. For that, Kupchan says, Bush deserves some credit for avoiding confrontations, and his seeming willingness to reach accords.