Answer by taking a quote from the following article:

Ramzan Akhmadovich Kadyrov (Russian: Ramzan Akhmatovich Kadyrov, IPA: [ra'mzan ax'mat@vjItc ka'dir@f], Chechen: K'adar Akh'mat-kIant Ramzan Qadar Axmat-khant Ramzan; born 5 October 1976) is the Head of the Chechen Republic and a former member of the Chechen independence movement. He is the son of former Chechen President Akhmad Kadyrov, who was assassinated in May 2004.

After his father, then President, was assassinated on 9 May 2004, Ramzan was appointed as the First Deputy Prime Minister of the Chechen Republic on 10 May 2004.  When his sister was detained by the Dagestan police in January 2005, Ramzan and some 150 armed men drove to the Khasavyurt City Police (GOVD) building. According to the city mayor, Kadyrov's men surrounded the GOVD, forcing its duty officers against a wall, and assaulted them, after which they left the building with Zulay Kadyrova, "victoriously shooting in the air."  In August 2005, Ramzan declared that "Europe's largest mosque" would be built in place of the demolished ruins of Grozny's shattered downtown. He also claimed that Chechnya is the "most peaceful place in Russia" and in a few years it would also be "the wealthiest and the most peaceful" place in the world. He said that the war was already over with only 150 "bandits" remaining (as opposed to the official figures of 700 to 2,000 rebel fighters), and that thanks to his father, 7,000 separatists had already defected to the Russian side since 1999. When responding to a question on how he is going to "avenge the murder of his father", Ramzan said:  I've already killed him, whom I ought to kill. And those, who stay behind him, I will be killing them, to the very last of them, until I am myself killed or jailed. I will be killing [them] for as long as I live... Putin is gorgeous. He thinks more about Chechnya than about any other republic [of the Russian Federation]. When my father was murdered, he [Putin] came and went to the cemetery in person. Putin has stopped the war. Putin should be made president for life. Strong rule is needed. Democracy is all but an American fabrication... Russians never obey their laws. Everyone was stealing, and only Khodorkovsky is in jail.  He remained the First Deputy Prime Minister until November 2005.

Was the mosque ever built?