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...The three nations reached an agreement on how to proceed in Madrid last June, but Turkish President Tayyip Erdogan has said Sweden, in particular, is not keeping its side of the bargain.
This week, Erdogan postponed accession talks indefinitely.
Of NATO's 30 members, only the parliaments of Turkey and Hungary have not yet ratified entry for Sweden and Finland, which are worried about their security after Russia's invasion of Ukraine.
WHY DOES TURKEY OBJECT TO SWEDISH AND FINNISH MEMBERSHIP?
Turkey says Sweden, in particular, harbours what Ankara says are militants from the banned Kurdistan Workers Party (PKK), which took up arms against the Turkish state in 1984.
The PKK is designated a terrorist group in Turkey, Sweden, the United States and Europe....
DOES TURKEY HAVE ANY OTHER GOALS IN BLOCKING ACCESSION?
Elections take place in Turkey in May. Some commentators see Erdogan's stance on NATO as an attempt to divert voters' attention from a cost-of-living crisis and to project an image as an international statesman.
Other commentators say he may want to use NATO ratification as part of a deal with the United States. Ties with Washington are strained by Turkey's conflict with Syrian Kurdish militants who have U.S. support in the fight against Islamic State.
Turkey also wants to buy F-16 fighter jets from the United States, but faces objections from some members of Congress....