China has no plans or ability to conquer Greenland, analysts say. But it does have wide-ranging ambitions to expand its presence across the Arctic region.

China has firmly rejected U.S. calls to join nuclear arms control talks with Russia, particularly following the recent expiration of the New START treaty. This development leaves the U.S. and Russia without binding limits on their nuclear arsenals for the first time in decades.

The Kremlin said Thursday it regretted the expiration of the last remaining nuclear arms pact between Russia and the United States that left no caps on the two largest atomic arsenals for the first ti...