Tension is flaring between Poland and Belarus over the rise in migrants crossing into the EU. Troops from both countries have been deployed to the border. Poland has closed a border crossing and said it's prevented hundreds of people from crossing.

Belarusian leader Alexander Lukashenko said Belarus and Russia will deploy a joint military task force in response to what he called an aggravation of tension on the country's western borders, the state-run Belta news agency reported on Monday. Lukashenko...

Ukraine's border with Belarus is seeing a troubling military build-up. Western intelligence agencies say Russian soldiers and weapons systems are ready and waiting in Belarus to open a new front against Ukraine — something that would stretch Kyiv's forces...