If you don't understand that LACNIC is an entity similar to RIPE, ARIN or APNIC you're operating from flawed assumptions there. LACNIC is a regional entity that controls the supply of blocks of ipv4/ipv6 addresses, issued to ISPs.
The IP address is not "registered" to LACNIC, it comes from LACNIC and is issued to an ISP. As does any other IP address for an ISP with a business address in the LACNIC region.
https://www.lacnic.net/631/2/lacnic/coverage-area
The IP you've posted belongs to a /24 block issued to autonomous system AS262254, which does appear to be a Belize corporation with a mail.ru (russian version of free gmail/yahoo webmail) contact address.
The fact that it's a mail.ru address doesn't really say anything, anymore than a person anywhere in the world can access a yahoo or gmail webmail address over https in a browser.
Take a look at global BGP tables for where the /24 that contains that address is actually being announced from, and what other upstream transit/peer ASes are adjacent to it.
The AS in question appears to have as its primary upstream AS57724, which does seem to represent itself as a Russian hosting/DDoS filtering company.
https://ddos-guard.net/en
aut-num: AS262254
owner: DDOS-GUARD CORP.
ownerid: BZ-DALT-LACNIC
responsible: Evgeniy Marchenko
address: 1/2Miles Northern Highway, --, --
address: -- - Belize - BZ
country: BZ
phone: +7 928 2797045
owner-c: HUN8
routing-c: HUN8
abuse-c: HUN8
created: 20121205
changed: 20170825
inetnum: 190.115.16.0/20
inetnum: 2803:f900::/32
inetnum: 186.2.160.0/20
nic-hdl: HUN8
person: Huan Nadas
e-mail: xengine@mail.ru
address: Avenue Jorge Perez Concha, 712, -
address: 090511 - Guayaquil -
country: EC
phone: +7 9282797045 [0000]
created: 20150320
changed: 20200923