Запрещённое вложение изъяли.

Because it agrees with вложение, which is a neuter singular noun.

• вложение = a neuter noun
• so the modifier must match it in gender, number, and case
• therefore: запрещённое вложение

This is the same agreement pattern you see in phrases like:

• новое письмо = a new letter
• важное сообщение = an important message

So запрещённое means forbidden / prohibited, and its ending shows that it is describing a neuter singular noun.

It is technically a past passive participle from the verb запретить (to prohibit / forbid), but in this sentence it functions very much like an adjective.

So for a learner, it is often easiest to understand it as:

• запрещённый / запрещённая / запрещённое = prohibited, forbidden

Russian uses participles this way very often, and many of them feel almost adjectival in normal usage.

Because the word is pronounced with yo, not plain e:

• запрещённое = roughly zapreshchyonnoye

In Russian writing, ё is often replaced by е, especially in ordinary texts, so you may also see:

• запрещенное

But the correct pronunciation is still with ё.

Here вложение is the direct object, so it is in the accusative case.

However, for many inanimate neuter nouns, the accusative singular looks exactly the same as the nominative singular.

So:

• nominative: вложение
• accusative: вложение

That is why the form does not change.

The same is true for запрещённое, which also has the same nominative and accusative singular form for neuter inanimate nouns.

Because the sentence leaves the subject unstated, but the verb shows that the hidden subject is they.

So the structure is basically:

• (Они) изъяли запрещённое вложение.
• They removed / seized the prohibited attachment/item.

Russian often does this when the doer is unknown, obvious, or unimportant. English often uses:

• they
• someone
• or a passive like was removed

So изъяли is plural past tense because the implied subject is they.

Russian often prefers an active verb with an omitted plural subject instead of a passive construction.

So instead of saying something directly equivalent to:

• The prohibited attachment was removed

Russian very naturally says:

• Запрещённое вложение изъяли.
• literally: They removed the prohibited attachment/item.

Both can translate naturally into English, but the Russian sentence is an ordinary and idiomatic way to express this idea.

Изъяли is the past plural form of изъять, a perfective verb.

Its basic meaning is something like:

• removed
• seized
• confiscated
• taken out

The best English translation depends on context.

For example:

• in an official or legal context, confiscated / seized
• in a technical or moderation context, removed
• in a customs or security context, seized

So the verb suggests that the item was actively taken away or withdrawn.

Because the sentence refers to a completed action.

• изъять = perfective
• past tense изъяли = they removed/seized it completely

Russian perfective verbs usually present an action as a whole, with a result.

If you used an imperfective verb instead, it would sound more like an ongoing process, repeated action, or something viewed from inside the action rather than as a completed event.

Not always. Вложение has several possible meanings depending on context.

Common meanings include:

• attachment (especially an email attachment)
• inserted item
• enclosure
• sometimes even investment in other contexts

In this sentence, the intended meaning depends heavily on where it came from. For example:

• in email/software language: attachment
• in a mailing or package context: enclosure / enclosed item
• in security or customs language: possibly a contained item

So a learner should not assume вложение always means exactly the same thing in every situation.

Yes. Russian word order is flexible, and changing it usually changes emphasis, not the basic meaning.

For example:

• Запрещённое вложение изъяли.
• Изъяли запрещённое вложение.

Both are possible.

The version you have starts with запрещённое вложение, which puts attention on the item itself. Starting with изъяли would put more immediate focus on the action.

So the original order is natural, but not the only possible one.

You could say:

• Они изъяли запрещённое вложение. = They removed/seized the prohibited attachment/item.

But Russian often leaves out pronouns like они when they are not needed. In many contexts, adding они would sound more explicit than necessary.

That is why the shorter sentence:

• Запрещённое вложение изъяли.

sounds natural and normal.

A careful pronunciation would be approximately:

• zap-re-shchYON-na-ye vlo-ZHE-ni-ye iz-YA-li

A few key points:

• ё in запрещённое is stressed: -щён-
• ж in вложение sounds like the s in measure
• изъяли has a hard break after the prefix because of ъ, and the stress is on я

A more Russian-looking stress guide:

• запрещённое вложе́ние изъя́ли

If you want, you can think of the rhythm as:

• za-pre-SHCHYON-no-ye vlo-ZHE-ni-ye iz-YA-li