Reliable OSSINT sources for Russia-Ukraine frontline updates and leverage points

[AdamAM]

I'm trying to get a clear, factual understanding of the current military and geopolitical situation in the Russia-Ukraine conflict, but I'm overwhelmed by conflicting reports and analysis from different media sources. I understand the basic historical context of the 2014 annexation of Crimea and the 2022 invasion, but the front lines seem to have stagnated into a war of attrition. For those who follow defense analysis or regional politics closely, what are the most reliable open-source intelligence tools or analysts to follow for accurate updates on territorial control and military capabilities? Beyond the battlefield, what are the key economic and diplomatic pressure points being leveraged by both sides and their allies that will likely determine the conflict's trajectory in the coming year?