1 Russia

1 tell-tale

2 informer (esp. to police)

3 whistleblower

4 grass

1 Venice

2 Venezia

1 close

2 familiar

3 intimate

4 closely (related)

5 to foster close ties

6 to pay close attention

1 secret code

2 ciphertext

3 password

4 PIN

1 inextricably linked (idiom)

2 inseparable

1 flowering autumn grass, fine net (idiom); fig. abundant and exacting punishments prescribed by law

1 close relation, no gap (idiom); intimate and nothing can come between