The first of 800 UK troops being sent to bolster Nato defences in the Baltic have arrived in Estonia. The 120 soldiers from the 5th Battalion The Rifles will set up a UK headquarters in the country before the remaining troops reach next month. The Defence Secretary said, they would deter Russian aggression.<br/><br/>UK is taking a leading role in Nato's enhanced forward presence operation, aimed at reinforcing the alliance's eastern border. Tensions between Estonia and Russia increased as a result of the Ukraine conflict, which resulted in the annexation of Crimea by Russia in 2014.