India has a huge wheat surplus that is available for export, and the next couple weeks will be crucial for a good harvest. It will be known whether the crop is good this season, soon. India could very easily step into the breach to supply wheat but the problem is that the country is not set up to move out such massive quantities of grain, i.e., terminals, ports, loading facilities etc. That's going to be the bottleneck, not actual production or existing stores of grain.

Sunflower seeds, on the other hand, are going to be a major problem. They are used to extract cooking oil, and Ukraine was a major supplier.