President Vladimir Putin opened a stretch of highway in Russia’s Far East that will make it possible for the first time to drive by road across the sprawling nation — starting in Europe and ending in Asia. Russian officials are hoping the 6,214-mile Moscow to Vladivostok trek will open a window to the East and the ever-expanding Chinese market. The linchpin Chita-to-Khabarovsk link, named after the frozen Amur River that it crosses, connects some of the world’s most inaccessible regions. The planned route had been on the drawing books since 1966, but for almost two decades, little more than 22 miles were built each year. After the decision to speed up construction of the 1,345-mile Amur highway, Russia’s government road body pumped 26 percent of all its available funding into the project. The European Bank for Reconstruction and Development also provided a $25 million loan. Engineers and construction crews worked around the clock, completing on average half a mile every 24 hours.