LONDON — Lines at neighboring borders and protests are just some of the scenes in Russia following President Vladimir Putin’s call for partial military mobilization. Last week, Putin ordered up to 300,000 Russians to serve in the invasion of Ukraine that began in February. Since then, thousands of citizens have fled the country to bordering nations, including Georgia and Mongolia. A satellite image of the Russia-Georgia border taken on Tuesday shows a multitude of cars and people waiting at the crossing. According to Russian state news outlet Tass, more than 5,000 cars had created the traffic jam, which was up...