ISW sees air attacks as most probable option https://www.understandingwar.org/backgrounder/putin%E2%80%99s-likely-course-action-ukraine-updated-course-action-assessment

Half of russian army amassed near Ukraine and Belarus https://twitter.com/i/web/status/1488976542034182147

Russian letter to Ireland https://twitter.com/i/web/status/1488919913448230918

Iskander in Belarus https://twitter.com/Ozkok_A/status/1488980508163858437

Russia parks LNG tanker near Kaliningrad https://twitter.com/tmarzecmanser/status/1488797385585213440 contingency against sanctions

The FT has more https://www.ft.com/content/646b11bc-1955-4222-9f24-92ed95490c04

Morej jamming equipment https://twitter.com/Osinttechnical/status/1489079974388772864?cxt=HHwWgMC5uZyWo6opAAAA

Lots of videos with ROSGVARDIA en route to Ukraine.