Taiwan's Taipei-Shanghai twin-city forum is caught in a political fight ahead of Taipei's mayoral election, and the event's future looks shaky — a negative for cross-strait city ties, neutral-to-positive for those wary of Beijing's political strings.

• DPP mayoral candidate Puma Shen said he would cancel the forum if elected, as long as it keeps coming with political preconditions and delivers no real benefit.
• The forum, planned for December, hit a snag when Taiwan's Mainland Affairs Council refused entry to a senior Shanghai Taiwan Affairs Office official, allowing only lower-level staff to visit.
• Current mayor Chiang Wan-an criticized the central government for blocking the official, while the MAC brushed off the forum's importance and noted the next mayor is not yet known.
• Shen argues Taipei should put its energy into exchanges with many international cities instead, since Shanghai and Beijing are just two of many options and others come without political conditions.
• Shen left the door open to a better version — one that protects Taiwan's sovereignty, works "capital to capital," and delivers real value.

Outlook: The forum's fate now hinges on the mayoral election result; a Shen win likely means it is shelved or reshaped, while a Chiang win keeps the fight with the central government over Chinese guest lists going.