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international waters. stock markets in europe and the us rebound after days of turmoil between police and supporters of the opposition leader, imran khan, as they try to arrest him at his home. we start in the us, where washington has summoned ambassador after a russian jet fighter collided with an american drone over the black sea. the us military�*s european command says the russian fighter plane struck the propeller of the unmanned us aircraft, causing it to crash. president biden has been briefed about the invasion of ukraine more than a year ago. the bbc�*s gary o'donoghue i...

Picture rather thanjust looking at a snapshot of a single asset or a single building, because the successes of the ones that are still intact and perform perfectly well is as important as its neighbours that have collapsed, and actually having that distribution, having that overview, is really key to what we do and what can learn from this earthquake. but the collapse of some buildings isn't because of poor construction. in some areas, the ground movement was so great it exceeded what the buildings had been designed to withstand. and in others, a process called liquefaction turns the ground in...

Was so great it exceeded what the buildings had been designed to withstand. and in others, a process called liquefaction turns the ground into a heavy fluid, like very wet sand. a telltale sign of this is a building that's toppled over. at the engineering company arup, computer simulations show why some buildings fail. we're starting to see more movement in the columns. this part of the building is moving more. the connection with the central core has failed. that part has collapsed. this part has collapsed. the building has performed really, really badly. but buildings can be designed to with...

Picture rather thanjust looking at a snapshot of a single asset or a single building, because the successes of the ones that are still intact and perform perfectly well is as important as its neighbours that have collapsed, and actually having that distribution, having that overview, is really key to what we do and what we can learn from this earthquake. but the collapse of some buildings isn't because of poor construction. in some areas, the ground movement was so great it exceeded what the buildings had been designed to withstand. and in others, a process called liquefaction turns the ground...

Like very wet sand. a telltale sign of this is a building that's toppled over. at the engineering company arup, computer simulations show why some buildings fail. we're starting to see more movement in the columns. this part of the building is moving more. the connection with the central core has failed. that part has collapsed. this part has collapsed. the building has performed really, really badly. but buildings can be designed to withstand seismic events. we can see the performance of the columns, and the beams, and the floors, and the ceilings, and everything remains intact. so that's a c...