"If you look at the weapons we've provided them, we've made it very clear that they can use them to retaliate against Russian targets across the border that are conducting attacks," U.S. State Department spokesperson Matthew Miller said at a briefing on Sept.

Ukraine is a sovereign state and has the right to use weapons of its own production, and they have a lot of them. Look at the programs they have launched over the past year,” he said, adding that the U.