NATO released new satellite images on Sunday to support claims by the Ukraine and U.S. governments that Russia had allowed tanks to cross the border into the eastern part of this country.
Moscow has vigorously denied the charges, but if true, it would mark a significant escalation of the already bloody conflict in the east, now in its second month.
In the satellite images, according to a NATO statement, tanks can be seen leaving Rostov-na-Donu, a region in southwestern Russia, before appearing in Ukraine.
