The usual fare: log out, disable biometrics, use long pins and passwords, power off. Prefer a burner device, or clean your device and restore when you arrive. I remember how Google's internal guidelines for travel circa 2011 required to remove any material under NDA from your laptop when traveling to China or Russia; you had to restore it over the VPN after a safe arrival. Funny that now the same precautions apply to…
How do you restore it via VPN? Don't you first need a workable OS to connect to VPN first?