俄乌冲突，进入了第五个年头……

Core Viewpoint - The ongoing Russia-Ukraine conflict, which has lasted for four years, is characterized by significant changes in battlefield dynamics, tactics, and troop availability, with no clear path to peace in sight [6][30]. Group 1: Battlefield Changes - The conflict has shifted from a rapid offensive strategy to a stalemate, with both sides entrenched in a war of attrition since early 2024 [11][20]. - Initial Russian strategies aimed for quick victories but were thwarted by Ukrainian resistance, leading to a prolonged conflict marked by low-intensity, high-consumption confrontations [8][11]. - The battlefield has evolved into a "Russian offense, Ukrainian defense" scenario, with Russia leveraging its numerical and logistical advantages [11][20]. Group 2: Tactical Changes - The nature of warfare has transformed from traditional methods to a mixed approach incorporating AI, unmanned systems, and electronic warfare [14][17]. - Ukraine has effectively utilized asymmetric tactics, such as low-cost, high-impact operations, to regain momentum in the conflict [15][17]. - Both sides are engaged in intense electronic warfare, with Russia deploying advanced jamming systems while Ukraine relies on allied technological support [17][20]. Group 3: Troop Availability Changes - After four years of conflict, both Russia and Ukraine are experiencing a depletion of troop resources, with Ukraine facing a more severe manpower crisis [21][22]. - Russia's military personnel target is set at 2.389 million, while Ukraine's active military force is approximately 880,000, highlighting a growing disparity [23][25]. - Recruitment strategies differ significantly, with Ukraine relaxing age limits and seeking foreign volunteers, while Russia employs economic incentives and institutionalized conscription [25][30]. Group 4: Geopolitical Implications - The prolonged conflict has strained Western unity in supporting Ukraine, with increasing fatigue and dissent regarding ongoing aid [27][29]. - Diverging strategic goals between the U.S. and Europe are becoming apparent, leading to a weakening of transatlantic partnerships [29][30]. - The conflict has also elevated the voice of Global South nations, which are asserting their strategic autonomy and influencing global governance dynamics [30].