UNITED NATIONS, Sept 20 (Reuters) - France will summon Iran's ambassador and take appropriate measures in response after Iranian authorities sealed a French language centre affiliated with its embassy in Tehran, the Foreign Ministry said on Sunday. Ties between the two countries have been strained for years over Iran’s nuclear programme and Tehran detaining several French nationals. Key points and original sources are listed below.

• UNITED NATIONS, Sept 20 (Reuters) - France will summon Iran's ambassador and take appropriate measures in response after Iranian authorities sealed a French language centre affiliated with its embassy in Tehran, the Foreign Ministry said on Sunday.S1

• Ties between the two countries have been strained for years over Iran’s nuclear programme and Tehran detaining several French nationals.S2

• In response to the Iranian authorities' decision to close a French language center affiliated with its embassy in Tehran, France vowed to take appropriate measures.S3