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The North Korean leader must be “sincere” and “serious” for talks to take place, the US president says US President Joe Biden hasn’t ruled out a face-to-face meeting with Kim Jong-un, but insists that the North Korean leader would need to show the right attitude for it to happen.

Western sanctions have failed to sink the Russian economy due to a “big country trap” effect, a recent study by the Institute of Economics of the Russian Academy of Sciences has found. If a state is a major player on the global market – like Russia – the imposition of restrictions on its exports will…