Can I travel from Ukraine to the US via B1/B2 in case I have stamped H4 visa that is not valid until 21st Sep?

Both the B and the H are non immigrant visas and are appropriate for temporary travel tot he US. If you are admitted in B status and want to change...

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I need an advice

Not likely f that is the only offense but it possibly it will. You should meet with an immigration attorney before a determination on the criminal...

Would i be denied when i try to renew my f1 visa ?

The SIJS may pose an issue as to immigrant intent. You may have other issues. A predetermination on your case cannot be made as the decision...

Would my application for visa renewal be denied ?

It may be possible but the SJIS may pose an issue as regards to immigrant intent.

If someone was the victim of a crime in 2011 but they did not know anything about U Visas, can they apply now in 2014?

Yes it is possible as long as the crime is on the list of enumerated crimes. There is much to establish to perfect a good filing with CIS contact...

This comes up when there is a question as to the employer's ability to pay.

Yes this often comes up with there is some doubt of the employers ability to pay.

I-140 RFE- W2 of other employees.

Yes. This comes up fairly often when CIS is unsure of the employers ability to pay.

H4 to L1

If you are in status you may change status in the US and obtain the visa on you next trip abroad. There is no need to make a trip solely to obtain...

In addition to possible issues with the US consulate and CBP you may have issues traveling to Canada. Talk with your employers immigration attorney...