Ukraine invasion: Satellite images show 40-mile-long convoy of Russian military vehicles closing in on Kyiv
![تويتر \ The Economist على تويتر: "Building a wall 1,000 miles long and 40 feet high would require $711m worth of concrete https://t.co/uJVWm4Fuc0 https://t.co/bsYiMoI0k2" تويتر \ The Economist على تويتر: "Building a wall 1,000 miles long and 40 feet high would require $711m worth of concrete https://t.co/uJVWm4Fuc0 https://t.co/bsYiMoI0k2"](https://pbs.twimg.com/media/Crc--TmWYAAB4Ry.jpg)
تويتر \ The Economist على تويتر: "Building a wall 1,000 miles long and 40 feet high would require $711m worth of concrete https://t.co/uJVWm4Fuc0 https://t.co/bsYiMoI0k2"
![BBC News Graphics on Twitter: "1/ Before Mr Trump took office, there were 654 miles (just over 1,000km) of barrier along the border with Mexico. Since then, Congress has approved funding for BBC News Graphics on Twitter: "1/ Before Mr Trump took office, there were 654 miles (just over 1,000km) of barrier along the border with Mexico. Since then, Congress has approved funding for](https://pbs.twimg.com/media/DxbZTw5X0AAoxjv.jpg)
BBC News Graphics on Twitter: "1/ Before Mr Trump took office, there were 654 miles (just over 1,000km) of barrier along the border with Mexico. Since then, Congress has approved funding for
![A steamer sails 100 miles due east and then 40 miles on a bearing of 60^\circ. How far is the steamer from its starting point and at what bearing is it from A steamer sails 100 miles due east and then 40 miles on a bearing of 60^\circ. How far is the steamer from its starting point and at what bearing is it from](https://homework.study.com/cimages/multimages/16/steamer2678240277173592810.jpg)