the moscow stock exchange remains closed for trading for a forth straight day after the west imposed crushing sanctions on russia. according to jpmorgan, those sanctions have now sharply increased the chance of a russian default. in the u.s., we are just hours away from a new trading day after wednesday's strong rally on wall street. the dow alone closed up nearly 600 points. we're also seeing the price of oil climb, which of course means increased pressure on gasoline prices. since monday's close, crude has spiked more than 15%. and cnn's anna stewart joins us now from london. good morning, anna. so as russia's financial and trade ties with the world are increasingly cut off, what impact is this having? and just how will the country cope economically? >> form, rosemary. currently, russia's strategy here is to really pull up the financial drawbridge to the rest of the world. it's not letting any capital really leave what is being called fortress russia.