Austria is planning to impose border controls and possibly deploy troops to cut the number of migrants crossing from Italy, defense officials said, drawing a warning from Rome and reigniting a row over Europe’s handling of the refugee crisis.

Tensions between European Union countries over how to share the burden of migrants flared in 2015 when hundreds of thousands, many fleeing wars in Africa and the Middle East, began arriving in EU territory, mainly via Greece, and headed for Germany, Austria and other nearby affluent states.

Austria took in more than 1 percent of its population in asylum seekers at the time, which helped increase support for the far-right Freedom Party. Keen to avoid another influx, it said it would introduce controls at the busy Brenner Pass border crossing with Italy if one materialized there.