Estonia's military drills for 2,800 reservists comes after Estonia's neighbour Russia called up reservists last week to boost numbers fighting in Ukraine.
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Ukraine Invasion
Russian forces have invaded Ukraine from land, air and sea with strikes causing widespread damage. Global leaders have condemned the move and imposed sanctions.
Russian Sanctions
The Russian economy has been impacted by a raft of global sanctions as world leaders try to pressure Vladimir Putin to end the war in Ukraine.