U.S. warns Russia may invade Ukraine ---------------------------------------- The U.S. is raising the alarm with European allies that Russia may be planning an invasion of Ukraine as tensions flare between Moscow and the EU over migrants and energy supplies ---------------------------------------- New satellite images show Russian troops with heavy equipment massing near western border. Military build-up includes covert deployment of elite troop units, defence firm Janes says Ukraine claims there are now 100,000 Russian troops near its border ---------------------------------------- MIGRANT CRISIS Belarus threatens to cut off gas supplies if EU imposes further sanctions over migrant crisis on Belarusian- Polish border ---------------------------------------- Troops deployed ESTONIA LATVIA LITHUANIA Vilnus Moscow Yelnya Minsk RUSSIA RUSSIA Warsaw POLAND BELARUS UKRAINE Kyiv Bryansk Voronezh Kursk MOLDOVA GERMANY BALTIC SEA BLACKSEA Yamal-Europe pipeline One fifth of Russian gas supply to EU passes through Belarus NATO member Gas pipelines CRIMEA: Annexed by Russia in 2014 Area held by Russian-backed separatists Kuznica-Bruzhi border crossing: Thousands wait, hoping to enter EU 200km 125 miles ---------------------------------------- Sources: Bloomberg, Janes, Warsaw Institute © GRAPHIC NEWS