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Solutions
1) The one who belongs to China sits second to the right of U.
Here, we have two possible cases i.e. Case 1 and Case 2.

2) Only one person sits between the one who belongs to China and the one who belongs to Japan.
3) U does not belong to Japan.
4) The one who sits adjacent to U belongs to UK.
Here, we have two more possible cases i.e. Case 1 and Case 2.

5) The one who belongs to Canada sits second to the right of the one who belongs to UK.
6) One person sits between T and the one who belongs to Canada.
7) T does not belong to UK.

8) R sits third to the right of S.
9) R sits adjacent to T and does not belong to Japan.
10) The one who belongs to Russia sits opposite to the one who belongs to USA.
11) T does not belong to USA.
Here, Case 2 and Case 3 get eliminated.

12) Q neither belongs to UK nor sits at corner of the table.
Here, case 4 gets eliminated and our final arrangement will be:

Clearly, the one who belongs to Russia sits third to the right of the one who sits immediate left of the one who belongs to Canada.