Ми спілкуємося один з одним онлайн щовівторка.

Yes. Ukrainian often drops subject pronouns when the verb ending already shows who is doing the action.

• спілкуємося already means we communicate / we keep in touch
• So Спілкуємося один з одним онлайн щовівторка is also natural

Including ми adds a little emphasis or clarity, especially in teaching examples.

The base verb is спілкуватися, which already includes -ся.

In this verb, -ся is part of the standard dictionary form and helps give the meaning to communicate / interact / socialize. It is not translated word-for-word in English, but it is necessary in Ukrainian.

So:

• спілкувати by itself is not what you want here
• спілкуватися = to communicate, to interact, to keep in touch

And спілкуємося is the 1st person plural present tense form:

• ми спілкуємося = we communicate / we are in touch

Один з одним means with each other or one another.

Literally, it is something like:

• one with another

It is a very common Ukrainian way to express mutual action.

So:

• Ми спілкуємося = We communicate
• Ми спілкуємося один з одним = We communicate with each other

Without один з одним, the sentence is still grammatical, but this phrase makes the mutual relationship explicit.

Because the preposition з here means with, and after з in this meaning, Ukrainian normally uses the instrumental case.

So:

• dictionary form: один
• instrumental form: одним

That is why you get:

• один з одним

This is a set pattern, so learners are best off memorizing it as a whole expression meaning each other.

Yes, but один з одним is the common default form you will often see.

Depending on the people involved, Ukrainian can sometimes use forms like:

• одна з одною
• одне з одним

But in general learning and everyday use, один з одним is a very safe pattern to recognize and use for each other.

Here онлайн functions as an adverb, meaning online.

It tells you how / in what way the communication happens:

• спілкуємося онлайн = communicate online

It is an indeclinable borrowed word, so it does not change its form here.

Because щовівторка is a fixed adverbial expression meaning every Tuesday.

It is built with що- in the sense of every / each plus the day name form:

• щовівторка = every Tuesday
• compare with щодня = every day

This one-word spelling is normal.

A very common alternative is:

• кожного вівторка = every Tuesday

Both are natural.

It comes from вівторок (Tuesday) and appears in the genitive singular form:

• вівторок
• вівторка

In expressions like щовівторка, Ukrainian uses this form to create a recurring-time meaning: every Tuesday.

Because Ukrainian, like English, often uses the present tense for habitual or repeated actions.

So спілкуємося here means not only we are communicating right now, but also we communicate / we stay in touch regularly.

The word щовівторка makes it clear that this is a repeated habit:

• every Tuesday

Yes. Ukrainian word order is flexible, and the sentence can be rearranged depending on what you want to emphasize.

For example:

• Ми спілкуємося один з одним онлайн щовівторка.
• Ми щовівторка спілкуємося один з одним онлайн.
• Онлайн ми спілкуємося один з одним щовівторка.

All of these are understandable. The original sentence is perfectly natural, but changing the order can shift emphasis slightly, especially toward online or every Tuesday.

Because спілкуватися is broader.

• говорити = to speak / to talk
• спілкуватися = to communicate / interact / keep in touch

So спілкуватися fits well if the idea is general contact, conversation, or interaction online, not just the physical act of speaking.

In many contexts, розмовляти could also work if you specifically mean to talk / have a conversation, but спілкуватися is a very natural choice here.