150 U.S. paratroopers from the U.S. Army's 173rd Infantry Brigade Combat Team based in Italy attend a welcoming ceremony as they arrive to participate in training exercises with the Polish army in Swidwin, northern west Poland April 23, 2014.
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Ukraine crisis: Tensions prompt military exercises

24 April 2014 Last updated at 09:38 BST

President Barack Obama has warned Russia that he is ready to impose more sanctions if it refuses to implement an agreement to reduce tensions in eastern Ukraine.

His comments came as the first contingent of US troops landed in Poland for military exercises. An initial 150 soldiers are to be followed by a further 450 within days.

Natalia Antelava, is in Ukraine's eastern city of Donetsk where many pro-Russian militants have been active.