Supplying advanced warplanes to Kiev cannot be achieved in the “short term,” according to a top official Ukraine will not receive Western fighter jets for its current counter-offensive and will have to make do without them, the chairman of NATO’s military committee has said, citing the lengthy training required for pilots and problems with logistics.

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Moscow should take the US threat to halve Russia’s energy revenues seriously, billionaire Oleg Deripaska said on Saturday. To make his point the businessman cited last year’s sabotage of the Nord Stream pipelines and a recent train derailment in Siberia.