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- Ukraine has not used US-made Abrams tanks since they arrived in September, analysts said.
- Ukrainian forces are likely keeping them in reserve for next spring, they told Business Insider.
- Winter, Russia's fortified defensive lines, and logistics have made tanks obsolete, they said.
The US sent 31 advanced M1A2 Abrams tanks to Ukraine in September — but they've been notably absent from an actual fighting there.
Analysts told Business Insider that this is probably because it's hard to put them to good use, citing the worsening weather and Russia's hardcore defensive lines.