Kaczynski and Sikorski, both right-wingers, have often been at loggerheads over key foreign policy issues. The president, a eurosceptic and a staunch critic of Russia, has accused Sikorski of acting in line with Moscow's interests.
Asked about Sikorski's candidacy for the top job at the U.S.-led, 26-nation alliance, Kaczynski said, "He even got the backing of the opposition. This is a Polish politician and this would be a great success for Poland.
"Every Polish politician in that post has the approval of the Polish president," he told Radio Zet in an interview.
Polish Prime Minister Donald Tusk announced last week that his government would back Sikorski for the NATO job.
Jaap de Hoop Scheffer, a former Dutch foreign minister, is set to step down in 2009 after four years at NATO's helm.
Sikorski headed the defence ministry under the conservative administration of Kaczynski's twin brother Jaroslaw, but he was later fired. He joined Tusk's centre-right government after it won a 2007 parliamentary election.
Last Mod: 06 Ocak 2009, 14:13