- Russia's devastating war in Ukraine hit the one-year mark on Friday.
- Military experts told Insider that Russia is pushing forward with an offensive in eastern Ukraine.
- Putin has a small window to attack before Kyiv receives advanced Western armor, but Ukraine will need to hold out.
Russian President Vladimir Putin's horrific war in Ukraine hit the one-year mark on Friday, and the Ukrainians are facing a new test of their resolve as the conflict enters a new phase.