Sun, 04/23/2023 - 11:00 Tech Insider British soldiers attend the Winter Camp 23 military drills near Tapa, Estonia, Tuesday, Feb. 7, 2023. The Winter Camp exercises are regular drills conducted by NATO's multinational battle group in Estonia led by the United Kingdom.AP Photo/Sergei Grits Tags Military & Defense, Ricki Lee, INSIDER graphics, NATO, Baltic States, Russia, Putin, Weapons Source Front-line NATO allies worry they could be next after Russia's invasion of Ukra…