Question:
Oleg Aleksandrovich Prudius (Russian: Oleg Aleksandrovich Prudius; Ukrainian: Oleg Oleksandrovich Prudius, Oleh Oleksandrovych Prudius; born April 27, 1979) better known by his ring name Vladimir Kozlov, is a Ukrainian-American producer and retired professional wrestler. He is best known for his time in WWE, where he won the WWE Tag Team Championship once with Santino Marella. He is trained in freestyle wrestling, rugby, football, sambo, kickboxing, judo, jujutsu, Brazilian jiu-jitsu and mixed martial arts. Prudius has also worked as a stage and screen actor, notably having a small role in Spike Lee's 25th Hour., and a walk-on role in the second season of the HBO series The Wire.
On the April 4, 2008 episode of SmackDown, Kozlov made his official WWE debut as a villain, with the unique quirk of having no entrance music and no Titantron video - his "entrance" consisted of complete darkness except for a solitary spotlight following him to the ring. He defeated Matt Bentley in his first match, and over the following weeks, Kozlov would go on to easily win several matches, first against local talent and then established names including Colin Delaney, Funaki, Nunzio, Shannon Moore, Jimmy Wang Yang, Jamie Noble, and Domino. On the July 11 episode of SmackDown, Kozlov debuted an entrance theme and Titantron video as he defeated Stevie Richards. In the following weeks, as Kozlov continued to easily win matches, he began demanding "better competition". On the September 12 episode of SmackDown, he started to seek that competition, attacking Jeff Hardy. Over the following weeks, Kozlov would continue attacking both Hardy and the WWE Champion Triple H, eventually starting a loose feud between the three of them over the WWE Championship. On the November 7 episode of SmackDown, Kozlov earned a match against Triple H for the WWE title at Survivor Series after defeating The Undertaker by disqualification after he was attacked by Jeff Hardy. The match was originally intended to include Kozlov, Jeff Hardy, and Triple H, although Hardy was removed due to a storyline injury. The result of this was the addition of Edge to the match while it was in progress, and ultimately Edge would go on to pin Triple H and win the title. Continuing his pursuit of the WWE Championship, Kozlov competed in and was unsuccessful in winning a Beat the Clock Challenge match against ECW Champion Matt Hardy for another title shot. This led to the two meeting at Armageddon, where Kozlov gained his first pay-per-view win by defeating Hardy in a non-title match. Kozlov competed in the 2009 Royal Rumble match, entering as the sixth participant, but was eliminated by Triple H after eliminating The Great Khali, Carlito, and Montel Vontavious Porter. He then qualified to be part of the No Way Out Elimination Chamber match, where he was pinned for the first time after receiving a Last Ride from The Undertaker, though he still remained unpinned in one-on-one competition. Kozlov's undefeated streak in televised singles competition ended on the March 2, 2009 episode of Raw, in which he was defeated by Shawn Michaels; this match was for the opportunity to face The Undertaker at WrestleMania XXV. His first televised singles loss on SmackDown came against The Undertaker himself on March 13.
Answer this question using a quote from the text above:

What was Kozlov's character?

Answer:
Kozlov made his official WWE debut as a villain, with the unique quirk of having no entrance music and no Titantron video -

Answer the question at the end by quoting:

UFO are an English rock band that was formed in London in August 1969. They became a transitional group between early hard rock and heavy metal and the new wave of British heavy metal. The band's current lineup includes vocalist Phil Mogg, lead guitarist Vinnie Moore, bass guitarist Rob De Luca, keyboardist and rhythm guitarist Paul Raymond and drummer Andy Parker. They have gone through several line-up changes, leaving Mogg as the only constant member, and had two hiatuses (1983-1984 and again from 1989 to 1991).
Tensions had begun to grow between Mogg and Schenker in the late 1970s, possibly from Schenker often leaving before or during shows. Soon after UFO's show in Palo Alto, California on 29 October 1978, Schenker left the band. He made a brief return to the Scorpions before going on to form his own Michael Schenker Group. After Schenker's exit, UFO rehired Paul "Tonka" Chapman on guitar who brought over unused track ideas from Lone Star's drummer Dixie Lee. Shortly after, they released their next LP, No Place to Run in January, 1980. Produced by former Beatles producer George Martin, No Place To Run failed to match up to the success of its predecessors, though it fractionally missed the UK Top 10. Paul Raymond left the band at the end of the No Place To Run tour and was replaced by John Sloman from Uriah Heep for a couple of months and then by former Wild Horses guitarist and keyboardist Neil Carter, who helped fill the void in the songwriting left by Schenker's departure. Carter debuted with UFO on stage at the three-day Reading Festival on 23 August 1980, when the band played as the Saturday night headline act. At the beginning of the following year, UFO released the self-produced The Wild, the Willing and the Innocent, which had a lighter pop rock sound, which was popular at the time. The album achieved mild success in the UK, reaching the UK Top 20, and the single "Lonely Heart" was released. In February 1982 the band released Mechanix. It was very successful in the UK, where it reached No.8, the band's highest ever placing. Later that year, founding member Pete Way left the band to form Fastway with Motorhead guitarist "Fast" Eddie Clarke and then his own band, Waysted. He was replaced by Talas bassist, Billy Sheehan. UFO released Making Contact in 1983, but the album was a critical and commercial failure. Thus, that March, UFO decided to disband. The band played a UK farewell tour with Paul Gray (ex Eddie and the Hot Rods and The Damned bassist). However, there was a hint that this might not be permanent, when UFO released a compilation album featuring songs by UFO (as well as other groups featuring ex-members of UFO) entitled Headstone, the sleeve of which showed a headstone, denoting UFO with their formation date but an incomplete end date. This proved to be a short hiatus as, just short of two years later, in late 1984, Mogg assembled a new UFO line-up, featuring Paul Gray on bass again, ex-Diamond Head drummer Robbie France (replaced in 1985 by former Magnum drummer Jim Simpson), and Atomik Tommy M (Tommy McClendon), a former roadie who also wrote lyrics for Loudness, on guitar, with Paul Raymond rejoining shortly after and released Misdemeanor. This was followed by the 1988 EP Ain't Misbehavin. Despite the renewed activity of the band, neither release was financially successful and they officially disbanded again in 1989 after a string of guitarists replacing McClendon: Myke Gray of Jagged Edge in late 1987, in 1988 former Legs Diamond guitarist Rik Sanford and Tony Glidewell, while Pete Way rejoined on bass, and finally in 1989 future Cold Sweat guitarist Erik Gamans.

what happened during the hiatus beginning with 1978?
California on 29 October 1978, Schenker left the band. He made a brief return to the Scorpions before going on to form his own Michael Schenker Group.