The United States has marshaled support from its European allies for significant sanctions against Moscow should Russian President Vladimir Putin proceed with a new invasion of Ukraine. But the strategy of relying heavily on the sanctions threat to shape Russian behavior faces challenges and limitations. Political divides on the issue …

Taliban soldiers in Afghanistan disrupted the erecting of a security fence by the Pakistani military along the border between the two countries, Afghan officials said on Wednesday. Pakistan has fenced most of the 2,600 km (1,615 mile) border despite protestations from Kabul, which has always contested the British-era boundary demarcation …

At a traditional year-end news conference, President Vladimir V. Putin of Russia said a potential meeting with the U.S. was a positive sign, but he also demanded a quick response to his security concerns. President Vladimir V. Putin of Russia on Thursday sounded a positive note about the security talks …