Nuclear-armed North Korea has muscled its way onto the agenda of the G20 leaders' annual summit in Germany Thursday, with Pyongyang's first test of an intercontinental ballistic missile set to dominate discussions.
The US is seeking new sanctions against Pyongyang and is due to hold a summit with Japan and South Korea on the sidelines, while China and Russia are already urging restraint and negotiations.
Xi Jinping and Vladimir Putin have suggested a simultaneous freeze on North Korean nuclear and missile tests and South Korea-US joint military exercises -- a concept already rejected by Seoul and Washington.
The US and its allies are determined to avoid "rewarding bad behaviour", but a growing number of analysts -- and the New York Times editorial board -- say it will ultimately have no choice but to talk to Pyongyang.
Here are five questions and answers on the issue of negotiations.
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