When St. John Paul II last visited South Korea in 1989, China refused to let his plane fly overhead. Instead, the Alitalia charter flew via Russian airspace, providing John Paul with a first-ever opportunity to send radio greetings to Soviet President Mikhail Gorbachev. He said he hoped to soon visit Moscow.
Relations between Beijing and Rome have been tense since 1951, when China severed ties with the Holy See after the officially atheistic Communist Party took power and set up its own church outside the pope's authority.
China persecuted the church for years until restoring a degree of religious freedom and freeing imprisoned priests in the late 1970s.
Emeritus Pope Benedict XVI sought to improve relations with China and encourage the estimated 8 million to 12 million Catholics who live there, around half of whom worship in underground congregations.
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Recently, Francis' No. 2, Cardinal Pietro Parolin, told the Italian Catholic magazine Famiglia Cristiana that the Vatican was in favor of "a respectful and constructive dialogue" with Chinese authorities to try to resolve problems that limit religious freedom in China.
For the Vatican, the main stumbling block is the insistence of the state-sanctioned Chinese Catholic Patriotic Association to name bishops without papal consent.