Are North Korean hackers linked to other crypto hacks?

Could you please elaborate on the potential connection between North Korean hackers and other cryptocurrency hacks? Is there evidence suggesting that these hackers might be involved in a series of similar attacks? If so, what are the key indicators that link them to these incidents? Also, what kind of techniques and methodologies are typically used by North Korean hackers when targeting cryptocurrency? And finally, how does the international community respond to such hacks, especially when they are suspected to be perpetrated by state-sponsored actors?