Article 260 deals with the Jurisdiction of the Union in relation to territories outside India. It further states that the Government of India may by agreement with the Government of any territory not being part of the territory of India undertake any executive, legislative or judicial functions vested in the Government of such territory, but every such agreement shall be subject to, and governed by, any law relating to the exercise of foreign jurisdiction for the time being in force. 

Further Reading:

• Union Executive & State Executive
• Difference between Legislative and Executive