держать нос по ветру {v. phr.}
d'erzhat' nos pov'etru
{literally} to keep one's nose down wind (to look and see where the wind is blowing to)
To adjust to the circumstances, changing one's beliefs or behavior with no principals.
To be aware of all latest news and events on sth.
Всегда держи нос по ветру! — Always keep your nose down the wind!
See also:
держать руку на пульсе
держать хвост пистолетом
не опускать крылья