Стратегія важлива.

In Ukrainian, the verb to be is usually omitted in the present tense.

So:

• Стратегія важлива. = Strategy is important.

You do not normally say a separate word for is here.

This is very common in Ukrainian:

• Він лікар. = He is a doctor.
• Книга цікава. = The book is interesting.

In past or future, forms of to be can appear, but in the present tense they are usually left out.

Because важлива agrees with стратегія, which is a feminine singular noun.

Ukrainian adjectives usually change their endings to match the noun in:

• gender
• number
• case

Here:

• стратегія = feminine singular
• so the adjective is важлива = feminine singular form of important

Compare:

• важливий = masculine
• важлива = feminine
• важливе = neuter
• важливі = plural

Examples:

• План важливий. = The plan is important.
• Стратегія важлива. = The strategy is important.
• Рішення важливе. = The decision is important.
• Деталі важливі. = The details are important.

A very common clue is the ending.

Стратегія ends in -я, and nouns ending in -а or -я are often feminine in Ukrainian.

So learners usually recognize стратегія as feminine from its form.

That is why the adjective also takes the feminine form:

• стратегія важлива

Be aware that there are exceptions in Ukrainian overall, but -а / -я is a very strong feminine pattern.

It is an adjective.

In Стратегія важлива, the adjective is used as the predicate, meaning it describes the subject:

• The strategy is important

So grammatically it is still an adjective, just in a position where English also uses an adjective after is.

You can think of the structure as:

• Стратегія = subject
• важлива = adjective describing the subject

Yes, but the meaning and emphasis may shift.

• Стратегія важлива. usually means The strategy is important.
• Важлива стратегія. more naturally sounds like An important strategy or The strategy is important with strong emphasis on important, depending on context.

So if you want a simple neutral sentence meaning Strategy is important, Стратегія важлива is the safest choice.

Ukrainian word order is more flexible than English, but different orders often change focus or emphasis.

A helpful approximate pronunciation is:

stratehíya

Some notes:

• г in Ukrainian is usually pronounced like a softer h sound, not a hard English g
• я often sounds like ya
• the stress is typically on -гі-: стратегія

So you can approximate it as:

stra-te-HI-ya

A useful approximation is:

vazhlyvá

Some notes:

• ж sounds like the s in measure
• и is not exactly English ee or ih; it is a distinct Ukrainian vowel
• the stress is usually on the last syllable: важлива

So an English-friendly approximation is:

vazh-ly-VA

It is in the nominative case, because it is the subject of the sentence.

In dictionary form, nouns are usually given in the nominative singular, and стратегія is in that basic form here.

So:

• стратегія = nominative singular
• важлива also appears in the matching nominative feminine singular form

Yes, but it is less neutral and less common for a basic present-tense statement.

• Стратегія важлива. is the normal everyday way to say The strategy is important.
• Стратегія є важливою. is more explicit, sometimes more formal, or used for emphasis

Also notice that with є, Ukrainian often uses the instrumental after the adjective or noun in this kind of structure:

• важливою = instrumental feminine singular

For a beginner, the simplest and most natural version is:

• Стратегія важлива.

It can be understood either way depending on context, because Ukrainian does not have articles like a and the.

So Стратегія важлива could mean:

• The strategy is important
• A strategy is important
• Strategy is important

Usually the surrounding context tells you which meaning is intended.

This is a major difference from English, where articles are required much more often.