They have electricity in Ukraine?

Actually, it's the same as in most of the rest of Europe, the 2 round plugs. If devices are dual voltage or multi-voltage (look on the label, looking for a number between about 220 & 240 or so), then you just need the adaptor to make your plug fit the socket. If it only takes the US 120V current, you'll need a converter and an adaptor (the converter steps the high Euro voltage down to the US voltage, so it doesn't fry the device). The laptop will almost certainly be dual voltage, and the battery charger likely will be. Hair straightener, no idea. You can buy adaptors and converters at a lot of stores, including Walmart/Target type stores, travel stores, electronics stores (Fry's, Best Buy, Radio Shack, etc.), even a lot of hardware stores. Brand doesn't matter whatsoever for the adaptors, a reasonably intelligent person could probably figure out how to make one if they had the tools, but the converter you may not want to buy the complete off brand; if they're badly made, they'll just burn out and stop working.