Russian fighter speeds and leaves country (8)

I believe the answer is:

migrates

'leaves country' is the definition.
(migrate can mean to move to another country)

'russian fighter speeds' is the wordplay.
'russian fighter' becomes 'MiG' (Russian fighter plane manufacturer).
'speeds' becomes 'rates' (rate is the speed at which something happens).
'mig'+'rates'='MIGRATES'

'and' is the link.

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