Latvia needs a permanent US military presence to deter Russia and wants to boost its defences with US Patriot missiles, Defence Minister Artis Pabriks said on Monday as Nato's chief visited allied troops in the Baltic country. US Secretary of State Antony Blinken was due to arrive in Latvia's capital Riga late on Monday before a meeting on Tuesday with 29 Nato ministers. The alliance is <a href="https://www.thenationalnews.com/world/us-news/2021/11/26/us-says-all-options-on-the-table-in-responding-to-russian-build-up-near-ukraine/" target="_blank">alarmed by a Russian military build-up on Ukraine's borders</a>. “We need additional international assistance,” Mr Pabriks said. “We would like to have a permanent United States [military] presence in our country. And sea and air defence means basically going down to such systems as Patriot [surface-to-air missiles]." Nato troops were rehearsing battle skills in a snowy Latvian woodland with camouflaged tanks and live rounds, with 1,500 soldiers seeking to stop an attack on Riga by disrupting and stalling the unidentified adversary's advance north of the city. “Deterrence is critical,” said Canadian Lt Col John Benson, commander of the Nato battlegroup in Latvia. Prompted by <a href="https://www.thenationalnews.com/world/europe/vladimir-putin-gives-crimea-power-for-anniversary-of-annexation-1.839111" target="_blank">Russia's annexation of Crimea in 2014</a> and Moscow's support for separatists in eastern Ukraine, Nato has deployed four multinational battalion-size battlegroups to defend Poland and the Baltic states of Lithuania, Latvia and Estonia since July 2017. Moscow says it has no intention of invading the Baltic or Poland and accuses Nato of destabilising Europe by moving troops closer to Russia's borders. Nato Secretary General Jens Stoltenberg said there was “no imminent threat” against Nato. In May, Russia amassed 100,000 troops on its border with <a href="https://www.thenationalnews.com/tags/ukraine/" target="_blank">Ukraine</a>, the highest number since 2014, western officials say. Nato says there was another large military build-up on Ukraine's border this month. The Baltic states are seen as Nato's most vulnerable flank as they are linked to the alliance's main territory only by a land corridor of about 60 kilometres between Poland and Lithuania known as the Suwalki Gap. Military experts say that Russia, via Belarus, might capture the gap, gaining a land corridor to its heavily fortified exclave of Kaliningrad on the Baltic Sea. US troops are stationed in Germany but might not reach the Baltic fast enough in the event of such an attack, experts say. “We have revisionism at this moment going on in Russia … from that perspective we cannot be late here,” Mr Pabriks said, referring to a statement by Russian President Vladimir Putin that he would reverse the collapse of the Soviet Union if he had a chance to alter modern Russian history.