No, currently the IAF doesn't operate any Russian-made a/c. Over the years, they had some Russian a/c from the neighbouring Arab countries land in Israel (some by mistake, others were escaping the regims in their own countries, some were paid to deliver state-of-the-art technology so it could be examined by Western experts). In 1966, for example, Israeli intelligence agents convinced an Iraqi AF pilot to deliver his MiG-21 to Israel (for a sum of money, and an opportunity to live in Israel, or leave to any other country of his choice). At the time, there weren't much info known about the a/c in the west, and it was fairly important to Israel to get to know the a/c, as their neighbours have been using MiG-21's for a few years by that time (a Syrian MiG-21 was shot down by an IAF Mirage III in 1966, that was the first time a MiG-21 was shot down in combat anywhere in the world). At the time, the Egyptians were using their own MiG-21's for reconaissance missions over Israel. For some reason, Israeli fighters could never reach those spy planes in time to shoot them down. So, for a couple of months, the ex-Iraqi MiG-21 was actually on the IAF's operational roster! It was put on stand-by, ready to scramble to the air to try and shot down the Egyptian spy planes. The a/c was modified so it could carry Israeli-made AA missiles. It was to be flown by the Israeli test-pilots who examined the a/c. But the Egyptians stopped their high-speed flights over Israel just in time, and the a/c was never used operationally. Soon after, it was given over to the US, where it was also examined carefuly, and may have been used to train American fighter pilots. The a/c was given back to Israel a few years later. Now it can be seen in the IAF's museum (not in flying condition). It has a very distinctive silver and red livery.
Another example: In the late 80's, a Syrian pilot decided to leave his home country, and take a MiG-23 with him. The a/c was never intended to be used operationally. It was also examined by Israeli pilots and engineers, as well as American ones. It can also be found in the IAF museum (not in flying condition).